So far as far as Discord alternatives go, we can list them here:
IRC(The oldest and still continually used protocol for chatting, but prolly hardest for n00bs to onboard with)
XMPP/Jabber(Second oldest, easier onboarding depending on server)
Matrix(Is fine till you learn about self-hosting your own, cuz that's a real rabbit-hole to fall down in. Also encryption, fun!)
Fluxer(Relatively new, basically straight up copies Old Discord)
Signal(More of a one-to-one private messenger imho, but yeah)
Session(Can be one to many, still untested for me)
SimpleX(Don't know much about this one)
Cwitch(Or this oneβ¦)
DeltaChat(Have used this one before, pretty cool tbh)
Briar(More of an emergency thing)
Stoat(Formerly Revolt, interesting one)
Teamspeak(Another older one!)
Jami(I don't know much about this one tbh)
I'm sure I missed others lol. #discord #irc #xmpp #jabber #fluxer #signal #session #simplex #cwitch #deltachat #briar #stoat #teamspeak #jami