In terms of solutions on an individual-level: after a lot of trial and error I feel like what works for me is an absolutist cold-turkey-approach. I've pretty much banned all consumptive screen-time except some things like Hacker News, LinkedIn, YouTube (only existing subscriptions, no recommendations or shorts etc). Things I know I won't spend more than 15-20 minutes on and are not highly stimulating and made to high-jack your brain. Initially, I used to allow myself some leeway as in screen-time i.e. should be less than X duration, but it never worked.
The withdrawal-symptoms of going cold-turkey are intense but you get over them eventually and then once you've powered through a few weeks, and you try and go back and look at any type of "content" you see how much trash it all is. Even the "good ones" or things you tell yourself is "educational". Another important note is to have some replacements in place so that when you start seeing that new void of so much time on your hands, you don't feel empty/hollow but as a reminder to yourself that you had so many cool things to do.
The withdrawal-symptoms of going cold-turkey are intense but you get over them eventually and then once you've powered through a few weeks, and you try and go back and look at any type of "content" you see how much trash it all is. Even the "good ones" or things you tell yourself is "educational". Another important note is to have some replacements in place so that when you start seeing that new void of so much time on your hands, you don't feel empty/hollow but as a reminder to yourself that you had so many cool things to do.