Divide up the 'net into trusted and untrusted sources. Make the trust ratings public. Use search tools and corpuses such as the Google Books dataset to source "knowledge" back to pre-Internet roots, when necessary. In short: bring academic reputation back and bring it back hard.

It will make for a more elitist web, but given that even without ChatGPT we've had a problem with wildfire misinformation spread in social media networks it might be a change that's a long time coming.