Apart from diversifying investment, we need to change thinking. I investing only for profit or because I believe it's a good project and can create value in the future? For example, I read a lot of people say...bitcoin it's expensive now I would buy when dropping the price. But this is not investing, this is speculation, trading or whatever you would call this. If you trust a certain coin grow up not only because is the moment trending but because u believe it's worth, do less thinking about losing.