I agree, especially when you're new in crypto, if you learned how to trade and earned a high amount of money, don't be greedy and don't trade all of your money because it will only lead to loss. You should not stray on your path when you're earning, you should stick on the process, the process that you've learned so you can earn and trade safer.
Humans are always a strange animal, although people know to use all the money to trade is dangerous but their emotions do not allow them to retreat, it seems to be a common personality, depending on each person, this personality may be hidden or visible but it will appear when it receives an external impact. No greed is impossible, if we do not greed, we will not have ambition and if we do not have ambition, we do not need to come to this game, trading is an activity that expresses all of human nature, greed is one of them