I went on a big “social media diet” over the past couple years and it’s been amazing.
One trick I used successfully was, remove the apps from your Home Screen so you don’t see them.
Turn off emails, notifications, badge counts, etc so it isn’t constantly reminding you of its existence and is easier to forget.
Don’t leave the tabs open on your computer. There’s probably plug-ins that can shut the tabs after x amount of time.
For mobile, there are app time limit settings (iOS I think has this in the Settings page), intended for parental controls but hey you can use them too.
You don’t have to follow everybody or anybody. When you notice an app, a channel or a certain account is bothering you, consider muting or unfollowing them.
Consider finding other things like games, work, or books that you can absorb your full attention.
Remember, you are the boss. You can use it on your terms. You’ll realize very fast that FOMO does not really exist for these, when you stop using them constantly.
You can do this. You’re gonna feel a lot better on the other side, I guarantee it.