Yes a lot of people seem to think that missing out on BTC when it was cheap was like missing a once in a lifetime opportunity...but it isn't--BTC is a great thing but I think someday it's going to lose its dominance to another coin. And when that happens there will be new crypto millionaires (those who bought into the right thing at the right time).
My hope is that one of cryptos that I hold will be the one that helps to give me an early retirement some day...but until then I'm not gonna quit my day job lol.