However I have an unpopular opinion, interested to hear what others might think:
We should eliminate anonymity online. If you go on the internet everything you do should be tied back to your name. This can be done using device attestation. Everyone gets a private key tied to their name/address.
This is compatible with free speech. In fact it promotes free speech because being a "troll" becomes a lot more personal.
I think this way of living would be closer to our nature as tribal primates. It would improve behaviour and overall quality of life. Our brains are designed to have checks and balances from wider society which you don't get anonymously online.
This would also reduce the need for govt monitoring because any chat online could be "turned in" by an informer and then any criminals identified.