I am really interested in the social media blocking. I have been quitting social media for 5 or 6 years now. The hardest for me was Quora, I think. I don't know why, they where like the mafia: "Just when I thought I was out, they pulled me back in" What worked for me was blocking them on the router and the hosts files[0]. This meant there where two steps to unlocking a blocked site. And for extra friction I used a long router password and don't save it. The longer it takes you to reach the thing, the more opportunity to change your mind.
The good news is that social media addiction is relatively quick and painless to cure. I stopped missing them after about a week.
And there are a lot of positive outcomes from quitting this stuff (especially for doomscrollers and dopamine junkies ;) I have been quitting a lot of stuff recently like sugar, sweeteners, coffee, carbs and processed food! And for a little while it's rough. Quitting anything will be rough for at least a few days. But as you strip away more sources of artificial dopamine stimulation, the body compensates, or maybe you just become more sensitive to it. Real life starts to give you some of that dopamine buzz that you where chasing online (or in a can of diet soda!)
But but now I start to feel little dopamine kicks whenever I take some small positive action like doing some exercise or fasting, or walking past the junk food.
[0] crowd sourced hosts files to block ads, social-media and porn: https://github.com/StevenBlack/hosts