I think the most likely long-term solution is something like DIDs.
https://en.wikipedia.org/wiki/Decentralized_identifier
A small number of trusted authorities (e.g. governments) issue IDs. Users can identify themselves to third-parties without disclosing their real-world identity to the third-party and without disclosing their interaction with the third-party to the issuing body.
The key part of this is that the identity is persistent. A website might not know who you are, but they know when it’s you returning. So if you get banned, you can’t just register a new account to evade the ban. You’d need to do the equivalent of getting a new passport from your government.