Holding fluctuatif asset in  5 years is too long, because in this duration, maybe we will pass once or 2 times of bear markets. To gain muptiple profit in 5 years, I think we should be combine the investment,.I mean not only make invest on Bitcoin but also on stock market or Gold. When bear market in crypto market start, we can change portfolio of investment to Gold or high cap stocks. And we can enter again to crypto market after dumped 80% more, because this big crash is always happen in crypto.