Audience size is not the same thing as a business. A creator business starts when attention has a useful path.
Start with the problem
The strongest offers come from repeated audience pain points. Look at comments, replies, DMs, and search terms. The pattern matters more than one loud request.
Build the bridge
Free content should help people understand the problem. A lead magnet should help them take the first step. A paid offer should help them get a more complete result.
Keep it simple
You do not need a large product suite at the start. One clear offer, one owned audience channel, and one content format can be enough to validate the business.