Fundamentally, mastodon (and twitter, bluesky, etc etc) doesn't really work for me. I'm just remembering the sense of confusion when I first joined twitter - the idea that you subscribe to a feed of everything that someone says, and not to topics or threads is just a bit bonkers. It must sort people into groups with weird niche common collections of interests. I've tried running more than one account for different interests but it doesn't really work for me.