I only enter to reddit to check information I can't find in other places or because of communities there. I mostly enter for KDE reports and Stellaris lol
I have a Twitter account because my friend are there and they've abandoned Facebook almost completely, but I enter one in a month or so. I've been using Mastodon daily because I found a lot of people that also have my interests and hobbies, even in my language.
I only enter to Discord for casual gaming with friends, like one or two times a month.
And I've been trying to use PeerTube more, but a lot of content creators I like are still on YouTube, and PeerTube doesn't have an official app yet. I'm currently using Piped and NewPipe for watching videos (I use the YT app only when I want to support some creators).