my general time travel fantasy answer is "I'd go back and get @rahaeli.bsky.social's ADHD and EDS treated young, and meanwhile go do climate change activism" but if you limit my sphere to the last 15 years, then I fucking intervene to prevent Harry Potter and the Methods of Rationality's popularity.

Oh god *that* fic...

if I can't prevent the rise of Elon and Thiel and Zuck, maybe I could at least prevent the complete poisoning of Silly Valley's atheists.

okay, but how? Relentless mockery is not as efficacious as one might hope.