Yes, it is possible to double capital when trading crypto but it is not advisable to trade with money you cant afford to lose. Crypto trading is high risk and unpredictable, you shouldnt be trading since you have debt to pay within 2 months. It is going to bring you more stress and you will end up making wrong decision.
In theory everything is possible but I think there we come to the main problem. People are too greedy, they want too much in too short period of time. And when they accumulate loss they blaim someone else. Why risking soo much and push over the limits? Its better to make more conservative but not so risky trading strategy and have a little bit more patience in maiking your goals.