For you is picked from two things, and nothing else.
The content pillars in My Brand. What you make content about.
The creators in your Watchlists. Who you consider your space.
It is rebuilt every Monday.
The panel that tells you what is wrong
On Discover there is a How For you works control. Open it and it shows you both inputs, how thin each one is, and what to do about it.
That panel is the answer to almost every complaint about the feed. Vamos will tell you outright when you are following nobody, so the feed is guessing from your topics alone. It will tell you when no pillars are set, so it cannot match videos to what you make. Check it before assuming the feed is broken.
Fixing a generic feed
Sharpen the pillars. A pillar that excludes nothing matches everything. Fitness pulls in the whole category; training around a full-time job pulls in the videos you would actually learn from.
Follow more people. A handful of creators gives the weekly pick very little to choose from. More creators means a wider pool and a more varied feed.
Wait for Monday. Changes to your pillars or your Watchlists shape the next rebuild rather than the current feed. If you have just changed both, the feed you are looking at was built before you did.
Following is the unfiltered version
If you do not want anything inferred, use the Following tab. That is only the creators on your Watchlists, newest first, with no picking.
Useful as a cross-check. If Following looks right and For you looks wrong, the problem is your pillars.