I hope I am wrong and you come back in a year from now to prove me wrong but I think it is 99.99% impossible to turn it into $1 million just by buying and holding.
Why not? You can do it if you are lucky. For example with only 50k wou can invest into altcoin that will make x10 in less than a year (imho it is possible) and then find some ICO that will make at least x2 after the croudsale. This exap,pe is
very rough but if you are lucky you can be able to do something like it. One year is a long time in cryptoworld if this ICO frenzy will not stop soon.