i think so risky if you Holding bitcoin a long time , may be just 3-6 Month it's good . but , if you already got cheap or profit you should sell your bitcoin , and waiting dump again .
I think too, better not to hold the bitcoin too long, sell when it is getting profit and buy again when the price drops, because the price is now very difficult to predict then do not buy immediately, wait and observe the movement of the price, if the price going to stable you can buy because there a possibly for the price to go up