I'm one of those lucky few for whom 0xChat never worked... Signal and Telegram are good for community building until something better comes along... There is also Chorus, which is a nice (and newer) Nostr app:

+chorus

+chorus - Nostr Groups

Join, create, and participate in decentralized groups powered by the Nostr protocol. Connect with communities through censorship-resistant social n...

I've started some communities here but haven't done much with them...yet...