Akkoma and Pleroma are two popular "Mastodon style" Fediverse apps, I think born out of exactly this type of complaint about Mastodon, which you could get involved with if you wanted to be involved with better software without it being a one-man show.
I think it's made needlessly difficult by how sloppy a protocol ActivityPub is, such that different Fediverse apps can't really interoperate with each other except at a pretty rudimentary level, so you kind of have to pick one of the leading ones and imitate it, in order to be a citizen in its community and not have to build your own little community from scratch. But that's a problem without a real easy solution, I think.