That's why in bitcoin it takes extra patience. There are 2 options you can do when trading
First, if you do not want to suffer a lot of losses, you have to set a limit for losses, for example if your loss is close to 10% of capital then you can sell your coins
Secondly, if you do not want to lose a penny, you just have to wait until the value goes back up. Actually playing trading is very simple, it's just that most people want to get short-term profits.