I think about a great opportunity people had miss when Bitcoin was still in a lower price, imagine how many people Bitcoin would have made a millionaire, though by then most people were a bit skeptical about the growth of Bitcoin, if it has a good potential or save to invest.
We still have time to invest though, sure there are a lot of skeptics way back, some of them regret selling or not even buying at that time. But we can't get it back right? the best thing to do is to continue and move forward, adapt and accumulate bitcoin if we wanted to be self made crypto millionaire. And for those who have made it, then for sure they will just continue what they are doing.