I moved to Lemmy during the Reddit API debacle, and it’s been great. I’ve even started interacting with posts which I almost never did on Reddit.
I moved from xitter to Mastodon, but I don’t really use either anymore; it’s just not a form of social media that brings me joy.
I asked several of my friends to try out Matrix, and they tolerate it and message me there instead of Discord. I do a lot of video calls with my girlfriend through Matrix (via Element) and that’s been perfectly reliable. Matrix has actually worked better than Discord for me, since I use Linux (Arch btw) and my webcam frequently has green flashes in Discord but not on Matrix. I had that issue on Fedora as well so I think it’s a Discord for Linux problem.