It would be helpful if you were more specific about the feed categories you’re looking for (e.g: specific hobbies, technology, …). Or is this supposed to be a generic question?

No Boilerplate, Reject Convenience and Veronica Explains.

Unfortunately I don’t think I have any advice I can give to discover PeerTube creators other than just browsing on PeerTube instances.

But what I can recommend doing is reaching out to your favourite YouTube creators and ask if they can mirror their videos to PeerTube. Obviously they aren’t guaranteed to do so, but the more people ask, the more likely it becomes they’ll eventually do it or at least consider it.

You can use accessibility and redundancy (backup of their content) as reasoning.