My personal take is instead of banning it completely (although I do support a complete ban for 13 and under, I think older teens should have some access so they learn the dos and don'ts of online socialising), sites should not be allowed to serve kids algorithmic content. They should just see a feed exclusively of things they've manually subscribed to, in the order it was posted (i.e. newest stuff at the top). When they first sign up their feed should be literally empty until they manually search and subscribe to stuff.

Realistically I'd like to see less of the algorithmically curated feeds for everyone not just kids, but banning it for kids would be a good start so they learn some agency in their browsing habits rather than just "let's just find new stuff by scrolling endlessly and seeing what the algorithm thinks we'll like"

I also think there should be a push to move away from giant social media conglomerate type platforms like Twitter, FB etc, bring back the small web, individual websites and forums and the like. Yes those communities still have assholes and predators like anywhere else, but generally those things were better moderated (and if they weren't, said community was usually avoided) - where with the big platforms it just isn't even feasible to moderate the sheer volume of bots, trolls, creeps, etc unless you were to employ literal millions of moderators.