Big challenge? That is what we have to face as a bitcoin trader, if you want to get big profits there is definitely a big risk, namely loss. There is no easy process to look for profit, because everyone has a strategy in trading. Big capital, lots of experience, principles, and the courage of speculation will affect the way of trading. Today the price of bitcoin dropped at $ 12200 and it happened quickly, but I think this is only temporary and will definitely rise again. Let's see in the next few days.