I don't have a solution for Facebook, since it feels like there's a bit too much garbage on the platform. But for Instagram, I've started fresh following a limited set of close friends and interests.
Few enough that I can still participate and get updates about friends and interests without feeling the urge to check multiple times per day. If anything "important" happens to someone I'm not following, my friends are kind enough to fill me in if it's interesting.
Yep. I started with a new account to make things easier. Pruning from hundreds down to 10-50 is much harder than just thinking about who/what you actually care about.
Few enough that I can still participate and get updates about friends and interests without feeling the urge to check multiple times per day. If anything "important" happens to someone I'm not following, my friends are kind enough to fill me in if it's interesting.