Not necessarily a "regrets" post - but sometimes you just don't know any better. Had you more information you might have made different decisions. That is all.
Sure the meme got him to 40m+ worth of GME but he would have still come out nicely whether it was blown into the massive meme or not. My understanding is that he bought in at a $4 price so GME rallying 10x is still a massive win. The meme took him above and beyond. I think we stand to learn something from him, speaking as an amateur here of course.