That is greediness if we cannot feel enough when we take the profit. We still chase the profit no matter if the price is a rally to the higher price but suddenly, everything change and we are stuck in the higher price without any chance to make a profit except wait for a long time (again). But for bitcoin, that is a must coin that we should hold for a long time because the bitcoin price will increase higher in the future, so we need to collect more and more bitcoin to prepare our future, and we could make a big profit in the future too.