Emotional control is a necessary quality for traders, otherwise traders will go bankrupt. An investor with an uncontrollable mood should buy Bitcoin and forget it. It is best to sell coins back through the news in a few years.
I don't know, I guess to be able to control your emotions, you need to at least experience some sort of a big lost before you really know how to control everything. Its hard just to preach, don't be emotional because you can't really control what other people are going to do unless they went to that experience and really knows how to react because they have been in that situation before. And even if you have seen it, sometimes more practice is needed before you can really master the art of not involving your emotions when making a trading decision.