I migrated from Twitter to Mastodon when Elon Musk took over. It’s been really nice, and I I wish I’d have known about the Fediverse before then. I may have found an instance that is too comfy and perfect for me, though… I’ve been tempted to migrate my account over to a Calckey instance, but there’s no way that I’m not staying put. Other Fedi services that I’m interested in trying are PeerTube and Owncast.
I’ve accounts on Mastodon (first serious fediverse account*), PeerTube, Pixelfed, Funkwhale, Friendica (without content), Lemmy (both Beehaw and Sopuli), and Kbin.
*I had an account on Identi.ca 10 or more years ago, but the posts I read were too technical and logical to me at that time, so I stopped using it in favour of Twitter.