I think that advertising is the main problem. Most issues caused by social media ultimately originate from this way to generate money out of wasting people's time. Cut that source of revenue and suddenly there is no longer any incentive to get people addicted, encourage outrage, promote misinformation/clickbait, etc.
Related: http://jacek.zlydach.pl/blog/2019-07-31-ads-as-cancer.html (I totally agree with all of it)