Yes, one of the failures is greed. Humans in general have a greedy nature, so they quickly become arrogant and never care about the risk of losing. Crypto is a risky trade, some experienced people will avoid greed in trading. Many of those who become greedy will regret not taking the opportunity. In trading we must commit to a predetermined strategy, for example, the profit target is something that cannot be changed anymore. If the profit line has been reached, then immediately take it. And don't mind the temptation that the market will go higher, because that's still a prediction and far from correct.
Greedy as all human attitude and difficult how to stop it actually with new comer trader, they have bad mind how with less fund trading can earn much profit almost 100x and looks crazy with their target selling coin. Maybe greedy can stop some one with trading but have left of them make greedy as good experience later how keep effective take profit although with few percent only. Many time greedy make trader losing much money when have chance to sell on higher price waiting can hit more than 100x profit but when price drop they will cut loss.