Full social media ban would be easier and more effective imo. Public spaces would come back to life in no time at all if social media was heavily curtailed or banned entirely. This would be an obvious win for everyone involved outside of the terminally online and corporations benefiting from their lack of self control.

define short form content as anything under an arbitrary time threshold, legislate all online providers of short form content to mandate an arbitrary time limit per day for all users, add a law that parents knowingly allowing children to exceed national daily short form content limits are subject to penalty. seems fairly straightforward. but uh, I guess we could all capitulate to giving corporations our biometric data ...