I Want to Write About Several Things. Do I Really Need a Substack Niche?

If you are asking, “Do you need a niche on Substack?”, the answer is no: you do not need to choose one narrow topic before starting. You do need a recognizable reason for the same reader to open the next issue. A publication can cover books, creative work, and ordinary life if those subjects consistently serve one audience, question, sensibility, or outcome.

My view is that new writers should choose a reader promise before choosing a niche. Write six deliberate issues across two or three related subject lanes, then use reader response and your own appetite for the work to decide what deserves more space. Narrareach can keep that test beside the next draft and publishing decision. Do not launch three publications merely because your interests do not fit in one category label.

A Substack niche is a promise, not a prison

“Niche” is often used to mean a narrow subject: personal finance for teachers, reviews of translated fiction, or recipes for runners. That clarity can help a reader decide quickly. But subject matter is only one way to create coherence.

A newsletter can also be coherent because it repeatedly offers:

• a perspective, such as a designer examining how everyday systems shape behavior;
• a reader, such as independent writers building a sustainable creative life;
• a recurring question, such as how technology changes attention and work;
• a format, such as one reported local story every Friday;
• a feeling, such as a thoughtful pause from frantic online culture.

The practical test is not “Can I name one topic?” It is “Can the person who enjoyed this issue understand why the next one may also be for them?”

That distinction matters because a subscriber is granting repeated access to an inbox. A surprising topic can feel fresh when it continues the publication’s promise. It feels random when the writer cannot explain why it belongs.

Start with the same-reader test

List the subjects you want to cover. For every pair, ask whether roughly the same person would choose to read both from you.

Suppose you want to write about novels, creative routines, and the realities of freelance work. Those can belong together for readers trying to sustain an intellectual and creative life. A detailed guide to enterprise network security probably serves a different reader, even if you also know and enjoy that subject.

Use three questions:

1. Who is the issue for? Describe the reader’s situation rather than an age or job title alone.
2. What do they receive? Name the insight, practical help, story, or experience that repeats.
3. Why does this subject belong? Complete the sentence: “This matters to my reader because…”

If you can answer all three without twisting the language, the subjects may share a publication. If each topic requires a different reader, promise, tone, and publishing rhythm, you may eventually need separation.

Write a promise broad enough to sustain your curiosity

A useful publication promise is specific enough to guide a subscription decision and broad enough to support dozens of issues.

Try this sentence:

I write for [reader in a recognizable situation] about [two or three connected territories] so they can [understand, feel, decide, or do something valuable].

For example: “I write for people building a creative life alongside paid work about books, attention, and sustainable practice, so they can protect the work that matters to them.”

That promise permits range. A novel review belongs if it reveals something about creative attention. An essay about burnout belongs if it helps the same reader protect their practice. A productivity-tool roundup belongs only if it serves that promise rather than chasing an unrelated search term.

Avoid promises so broad that they explain nothing: “thoughts about life,” “things I find interesting,” or “a little bit of everything.” They may be honest descriptions of your mind, but they give a stranger no basis for subscribing.

Run a six-issue test before narrowing further

I would publish six issues before making a permanent niche decision. Choose three possible lanes and write two issues in each. Keep the publication promise, cadence, and distribution effort reasonably consistent so the comparison remains useful.

Use a simple plan:

Issue	Lane	Question to test
1–2	Core subject	Can I explain this territory with depth and energy?
3–4	Adjacent subject	Does the same reader respond to this extension?
5–6	Personal or experimental subject	Can I connect range to the promise without forcing it?

Before publishing, write one sentence explaining why each issue belongs. After publishing, record comparable evidence: opens or views in the same age window, replies, comments, direct subscriptions where reported, unsubscribes, and any reader language about what they want next.

Do not let one unusually strong or weak issue decide the niche. Its result may reflect the headline, timing, distribution, format, or subject. Look for a pattern across the pair and read the replies for reasons that the dashboard cannot supply.

Read the results without turning them into an algorithm myth

Substack says publication categories help people discover writing through its search and discovery surfaces. That makes an accurate category useful. It does not establish a public rule that every multi-topic newsletter is suppressed or that a narrow category guarantees distribution.

Treat your evidence in four layers:

Evidence	What it can tell you	What it cannot prove
Opens or views	Whether an issue earned recorded attention	Why every reader did or did not engage
Replies and comments	Which idea or feeling readers mention	What silent readers thought
Subscriptions and unsubscribes	Whether audience movement followed the issue	That the subject alone caused the movement
Your writing experience	Whether you can sustain the lane with depth	Whether the market will value it

Your own interest belongs in the decision. A subject that performs modestly but produces ten strong future ideas may be more durable than a high-performing topic you already resent writing about. The aim is a publication you can keep making for readers who know why they are there.

A worked example: several subjects, one useful pattern

Imagine a writer tests three lanes over six weekly issues. This is a constructed example, not a benchmark.

Lane	Issues	Average recorded open rate	Replies	Direct subscriptions reported
Creative practice	2	51%	7	8
Books and ideas	2	48%	6	7
Software tutorials	2	29%	1	1

The first two lanes differ in subject, but their reader response is similar. Replies to both discuss making time for serious creative work. The software tutorials attract some attention but little evidence of the same relationship.

The defensible conclusion is not that software is a bad newsletter topic. It is that this publication has stronger evidence for a promise joining creative practice with books and ideas. The writer could reserve software for occasional cases that clearly serve that reader, or develop it elsewhere after proving enough demand and capacity.

Open rates are platform estimates affected by email behavior and privacy controls. The comparison is useful only when the issues have similar ages and audiences, and even then it informs a decision rather than proving a cause.

Watch for signs that the promise is too broad

A broad publication needs adjustment when readers must repeatedly decide whether an issue is “for them” from scratch. One weak post is not enough evidence. Look for a repeated combination of signals:

• subscribers reply that they joined for one subject and cannot see how another relates;
• one lane consistently attracts a different vocabulary, set of questions, or audience;
• the publication description needs several unrelated clauses to explain itself;
• every issue requires a new introduction to justify why it belongs;
• you avoid sending an article because you expect much of the list to ignore it;
• the lanes require different cadences, prices, or professional identities.

The first remedy is often a clearer promise or lighter organization, not an immediate split. Rewrite the publication description around the reader, label recurring lanes, and test whether the next two issues feel easier to introduce. Separation becomes more sensible when the mismatch survives that work.

Use tags, sections, and separate publications for different jobs

Substack’s current tools provide three levels of organization.

Tags group related posts and create topic pages that can appear in your navigation. Use them when every subscriber should still receive the main newsletter but readers benefit from browsing one subject.

Sections are additional newsletters inside one publication. Subscribers can control which section emails they receive. Use a section when a recurring strand serves part of the existing audience and deserves its own email choice.

A separate publication creates a distinct promise, audience, archive, and operating workload. Consider it when the readers, identity, cadence, or business model are meaningfully different. Creating another publication is an operational decision, not a cure for uncertainty.

Start with the lightest structure that solves the reader problem. Tags are easy to reverse. A six-issue test is easy to learn from. A second publication asks you to maintain another description, welcome path, schedule, audience, and body of work.

Current Narrareach data supports treating a split as a real decision

On September 21, 2026, Narrareach had 410 active Substack publication connections across 381 workspaces. Only 17 of those workspaces had more than one active Substack connection.

This is a self-selected product snapshot, not a measure of all Substack writers. A connection does not prove how often a publication sends, whether its subjects overlap, or why the writer created it. The useful point is operational: Narrareach supports writers who manage more than one publication, but multiple-publication setups are a minority in this connected sample.

Use Narrareach’s Substack analytics workflow to keep each test issue, its lane, its publishing date, and the relevant outcome in one review cycle. Measure comparable issues, write a one-sentence conclusion, prepare the next draft from the strongest supported pattern, review whether it still fulfills the reader promise, then publish and repeat. Narrareach can organize the evidence and next action; it cannot decide your identity or turn six issues into a universal rule.

When a broad publication is the right choice

A broad newsletter can work when the promise remains clear even as the subjects change. It is especially reasonable when:

• readers primarily value your perspective or storytelling;
• the subjects affect the same person or recurring problem;
• variety is part of the declared experience;
• you are still learning what you can sustain;
• growth or monetization is not the publication’s main job.

If your goal is a writing portfolio or a place to think in public, accept that maximum topic clarity may not be the priority. You can still label the publication honestly so readers know they are subscribing to range.

If your goal is a paid specialist product, topic and outcome clarity matter more because the reader is evaluating a continuing purchase. That still does not require writing the same article forever. It requires a clear boundary around the value being purchased.

Choose your next issue, not your permanent identity

Write down three subjects you could explore for a year. Circle the two most likely to serve the same reader. Draft a one-sentence publication promise that holds both. Then outline two issues for each subject and two experiments that test the edge of the promise.

Your niche can emerge from published evidence, reader language, and sustained curiosity. The decision you need today is smaller: can a stranger understand who the next six issues are for, and can you still imagine wanting to write issue seven?