One brief note from our experience, while we tried for years to put limitations on screen time for our kids, we found it to do some measure of harm. Our kids are naturally quiet and reserved. Social media and online friend contact turned out to be beneficial for them, I think. We let plenty go because both our kids would refer to the fact their friends were playing a game (with chat) or joining some online channel, or even doing homework together at a specific time. Knowing you as a parent are taking social time away from kids that are light-social to begin with, especially seeing the look of importance in their eyes, its a bit heartbreaking. We could have done some things better but based on their personality, I think having some discussions about the effect of too much social media and online consumption has done more than imposing strict limits. But I'm guessing here and I have the benefit of hindsight. Not to mention I recognize this was us trying to do what we thought was right for our kids and may not apply for other families.
To me it feels like if the majority of parents are onboard with limitations and timeline then it would be a lot easier. Ironic how the asynchronicity of tech doesn't help in this case.