50 dollars is not so much. I would look for a coin where you could get at least 10% per day, maybe it's a pump. The next day it will be 55 US dollars. Further compliance with this algorithm, at least up to $ 100. Here you can play a risky game, if you are not afraid to lose.
$50 is not much but it is good to start investment of cryptocurrency like dogecoin or ICO
because dogecoin is low risk and the price is stable enough.