So far it's obvious that traders can't kill the greed there got in crypto rather it can be limited, because the crypto price movements can't be predicted perfectly, so a trader in profits will always want to hold on to that trade in search of more profits, sometimes it might turn out to be prices pumping continuously while sometimes it might dump after holding for long, so for me I would suggest the best way to limit greed is by taking out capital and 50% profits if we feel prices had pump so high and might continue pumping.