Earlier quoted context omitted.
My personal 2c on how to fix this is make everyone liable for what's on their website, regardless of who wrote it. I don't care if that breaks youtubes, facebooks, twitters and reddits business model.
How would that help if posting conspiracy theories and misinformation (other than libel) isn't illegal?
One is the goverement is hiding aliens in area 51, definitely not libel, not conductive to outrage, not dehumanizing political opponents, it does not actively harm national unity.
QAnon on the other hand claims Democrat figureheads are eating babies in satanic orgies, definitely libel, greatly harmful to national unity.
I furthermore think that just the liability would be great enough to completely change the face of this platforms, they would be on the defensive things that are not libel would definitely be censored.