If only somehow we managed to make social media uncool for the kids, that’s the most sure way they’d stay away from it.
I guess proper education on the real aspects of the social media phenomenon would be the real deal. For example, explaining how/why the companies use their algorithms to keep you in there; influencers only want to sell you a product; why posts/stories don’t reflect reality at all, etc.
But understanding all that would require quite some amount of emotional maturity from both the kids and parents themselves. Sadly, that doesn’t seem to be the reality at all, there are adults that still can’t see through the cracks..
No smartphones allowed at school, strict usage limits for older kids at home, etc.