I think 50k is definitely reasonable to become a millionaire in a couple of years. But that won't get you there fast. You need to have a good strategy and a plan on how to get there. First and most important thing will be not to put all your money into one coin. Which means you should be careful on what you invest your money in (that 50k). Make sure to be diversified, which means that you should hold several coins to avoid the risk of getting dumped (if you hold one coin and it "fails" your entire portfolio will "fail" as well). You can liquidate as well some of your holding during these years if you really need the money, but my recommendation would be that you don't do so, and try to hold as long as possible.