Its a good list. Its does have a sort of isolating feel to it, for sure. I was never a twitter user though, the thing I'd like to replace is private facebook groups, or private phpbb servers, focused on threads. Which, this place is, well more like an isolating twitter.
I've tried 4 instances so far. Its mostly a read only platform where if i say anything nobody will see it. There are a couple people (like 4) I talk to here who talk back, but unless I tag them by name theyre not going to see my posts.
Theres some interesting reading material and some useful bots. But a hub of discussion and community, i havent managed to make all tgat much headway in that regard since I got started here last year.
The friendica instance I'm on ended up working out as an RSS reader I mostly use for keeping on top of blogs. Tried to make that work for a few months.
I'm obviously still here, but yeah. Its not all roses, and I will probably be taking a look at bluesky (once I hear moderation has improved) and maybe nostr.
Still havent found a nice modern replacement for Candlekeep though.