This may be a good time to consider whether one program should really be handling all those things, or if it's putting too many eggs in one basket and asking too much of any one program. Discord seems comparable to a Chinese superapp, made to trap its users and become an irreplaceable part of their everyday lives. I think I understand it's hard to give up some of these features once you're used to them, but it seems worth doing. Personally I use a mix of IRC, XMPP, and Matrix, mostly IRC (internet people) and Matrix (IRL friends/family), though. I believe XMPP and Matrix both have some sort of voice or video chat support across some clients and servers, but if someone were to try to call me through them, it would seem "weird" to say the least. I usually get people on Mumble if we're gonna play a game and want a voice chat going. It's rock-solid, everyone I play games with seems fine with it. When we're done voice chatting, we close Mumble, a bit like hanging up a phone call.

As for video calls and screen sharing, not something that's been super normalized in my circle. Some of us stream to Twitch with OBS, but it's rare to say "hey come watch my computer screen for an hour in a 1-on-1 call". There is just one guy who seems like a heavy Discord user who seemed to want to do this sometimes. I showed him Jitsi to placate him, we can both join a session in a browser without accounts and I can see his screen. I wasn't a big fan of that, though, I'd rather just not let that be normalized, personally. A screenshot, video clip, describing it to me, letting it go, any of that seems better than being trapped in a screensharing/video call of uncertain length.