Mastodon. It's not invite-only like Bluesky, it doesn't track you like Threads and it's federated like Lemmy (in fact, there's some crossover in some instances).
Just get neighborhood kids you trust! I rounded up a few randos because I couldn't find my usual pack, and it started out fine, but a few of them decided it would be more fun to ignore the trash can and crack me in the nuts. I said I WANTED TO SIMULATE TWITTER! NOT REDDIT!!!