Your struggle is pretty much echoed to small and big creators. They start off with a specific niche or topic esp when it goes viral and become their channel persona then hit a creative block or out grown the same niche.

If I am to suggest, I'd advice you go whatever topic that interests you if you want to create content for longevity. True followers will follow because of "you" - what you can share to them vs your content. I have 2 channels: 1 for personal growth and 2 is anything outside that.

I only recently re-open all my social media including nostr.

Have fun and enjoy the process! 👌👏☺️