Thinking about some recent twitter conversations questions... what problem are you trying to solve?
Do you worry a lot about privacy? Most of your solutions displace ad revenue into Google and Facebook.
Want more competition? You'll want to redistribute user data more broadly

Worry about companies optimising too much for engagement? Think that would be solved by a paid model? Neither of these make much sense to me, but it definitely leads to more concentration. If you believe in filter bubbles, that makes them worse too.

You want to break Instagram and Youtube into separate companies? OK, but now advertisers have more leverage and can demand more user data. (Seriously, why would making the ad market more competitive make it less aggressive?)

You care a lot about data sovereignty and want companies handling user data to have lots of rules? OK - but that adds a lot of cost to a small company trying to compete with Facebook, and blocks their ability to grow fast in multiple countries. No Clubhouse for you!

You think interest-based ads have no financial value and we could easily turn it off without harming publishers. And also that interest-based ads are a mind-control tool that undermine democracy and curdle milk. OK... which is it? "It's too powerful, and also it doesn't work"

These might all be good ideas (though personally I disagree with about half). But they all conflict. There is no one simple easy policy (break them up! ban tracking!) that will do everything you want and nothing you don't want. This is how policy-making works.