Niche subreddit content marketing is a cadence problem, not a discovery problem.

The advice everywhere else, vs. the rules that keep your accounts alive

Toggle between the two views. The left side is what every other piece on this topic teaches. The right side is what you actually have to do once you are running this across more than one product or more than three months.

The picker logic, in five steps

This is the actual flow inside pick_thread_target.py. Every time the cron tick fires for original threads, this runs. Steps 3 and 4 are the ones every manual operator forgets.

One operator, four products, four allow lists

The single piece of plumbing that keeps a multi-product operator from looking like a content farm is this: every product owns its own subreddit allow list, and the picker physically refuses to merge them. Below is the actual fan-out from config.json for four real projects. Cyrano never posts in r/restaurateur, PieLine never posts in r/AI_Agents, even when a perfect-fit thread is sitting right there.

The actual sub lists, verbatim from config.json

These are the per-product allow lists running in production today. Each product picked them by listening to its own buyers, not by copying a generic "best subreddits for marketing" list. If your niche is not represented, the principle is what matters: 8 to 15 subs that your specific buyer actually inhabits, not the largest neighbor.

The picker pulls from exactly one list per cron tick. The cross-product join you might draw on a whiteboard is rejected at score time, by design.

The eight-rule operator playbook

You do not need our tool to follow this. A spreadsheet with one row per sub, columns for last_posted_date and self_promo_count_30d, plus a calendar reminder will get you 80 percent of the way. The other 20 percent is mechanical discipline that breaks down once you cross 10 active subs across more than one product.

Why the cooldown matters more than the sub list

Most people who fail at this never fail at picking the wrong subs. They fail at posting too often in the right ones. The cooldown is the single rule that separates "this person shows up usefully and gets DMs" from "this account got muted by every regular in week three." A 3-day per-sub gap means a subscriber who reads every post in the sub sees you twice a week, maximum. A 1-day gap means they see you every time they open the sub, and that is exactly the cadence the human brain pattern-matches to spam.

The own-community rule is the inverse of the same idea. If you have your own subreddit (S4L runs r/screen_pipe, for instance), you can post every day there because the people in that sub opted in to hearing about your product. The default in DEFAULT_OWN_FLOOR_DAYS is 1, not 3. External subs are not your audience yet; they are hosting you.

The piece this gets you is patience. The piece every other guide gets you is enthusiasm. Enthusiasm without cadence kills more niche channels than bad copy ever has.

What changes when you run this across multiple products

A solo founder with one product can hold these rules in their head for about six months. Add a second product, and the wheels start coming off in week two. You start a sentence with "wait, was that for Cyrano or for S4L?" You post a Cyrano security tip in a r/restaurateur thread because it is technically relevant. You hit the cooldown on the wrong sub because your last post was about a different product entirely.

The fix is not willpower. It is enforcement at the scoring layer. Each post gets a project_name in the table. Each candidate thread gets a project_matches_sub() check before a draft request is even made. If they do not match, the thread silently drops out of the queue. The picker treats the cross-product post the same way it treats a thread you already commented on yesterday: invisible.

This is the single rule that lets one human run niche-sub content marketing for three or four products at once. Without it, the third product is the one that kills the first two by polluting their sub-of-record reputation.