All that we do is always at risk and it is up to you how to handle. Although investing in bitcoin is risky because of its volatility but if you are patient enough you will gain money more than what you expect so, consider the risk as a challenge if you want to become a successful investor.
I often get astonished with such comments. Like it seems that you are totally unaware of this bitcoin world. If you might have learnt the basics about crypto and investing or trading for earning money, you never had asked such stupid question. Look, this fluctuation is basic behavior of bitcoin and other crypto that makes them stand out of the box. Else, they would become same as others like stock etc.