Mastodon would be OK but the UI/UX is just terrible... interacting with someon on different instance is utterly cumbersome and I do/could miss a lot of posting in global view if someone didn't already followed someone from other instance...
Terrible compared to what? Mastodon is just fine for me. I'm an oblivious nerd here I guess. But I sometimes use Twitter too, can't say I find the UX refreshing by comparison.
For example bluesky. I tried masto a bunch of times, still have the account but each time I try to use it, it's so cumbersome. I tried alternative UIs but they are no that better...