That's a useful insight, and one we should remind ourselves of at these times.
I agree. The biggest difficulty can be when you know you should sell. The bull run won't be forever, so it is more important to get out with the little profit we can generate before getting into the teeth of the market. Though, greed can play a major role...
greed is indeed a major role in terms of gaining profits and losses, I have experienced this when I first started trading, because I wanted to get more results, always holding the price of the altcoins I bought, even though if they were sold I had made a profit, but I ended up holding back too long and in the end I got a loss as a result of that greed