Every market is full of ups and down and there is nothing anyone can do about it. It happens to stock markets and any other market you can think of, so I do not see how cryptocurrency market should be an exception and the fact that it is decentralized even makes it more volatile.

The most important thing is to know how you can handle yourself with the market trends, and even if you cannot, try as much as possible to keep your focus on the long term no matter what. However, it is not a bad idea, to learn one or few things about how to trade long term markets and take advantage of the trends.