Typically the rule of thumb is buy low and sell high. It is a crazy market a roller coaster ride of hi's and lows, with lately all kinds of lows. The question is, when did you get in? If you bought high, I would wait, but if you bought really well and can still realize profits, you could sell some. But really up to you. If you think the market is going to continue to go down down down, then you could sell and buy back the same coins at a cheaper price, which is basically shorting your position. But I am not a financial advisor. Always invest what you are willing to lose. good luck!