> I find myself reinstalling, resubscribing

Why? What is so important about these things that you felt the need to do this after getting rid of them?

Move from push to pull everywhere you can. Don't sign up for email notifications from a website, subscribe to their RSS feed, if you really want to follow the site. Then you choose when you get those updates.

When a website emails me marketing material, I find it offensive. I don't care if it's a good deal, I don't want it on principle. You need to draw a hard line and have boundaries.

What needs an actual notification that will interrupt you, vs just being in an inbox that you can look at when you want?

I turned text notifications off from one of my best friends, because he never sends me anything meaningful that needs immediate response. I just look at whatever he sent when I'm bored. Be ruthless.

Each time a notification pops up, ask yourself if it's more important than your friend's birthday, because that noise is what caused you to miss the notification you cared about.