I agree with you OP. Greedy is the biggest problem that every trader face, and even the pro trader will have the same problem. But if we still stick on the target price that we want, we will have a chance to eliminate the greed because we know that when the price can jump in a short time, the price will not stay on that price for a long time or the price will not always increase higher than that price.

We need to see when we need to sell the coin, especially if the price can touch the target price want, and don't expect to see the price will always go up more than the target price we have. Yes, it is hard but we need to try more and more so we the greed is not posses us and prevent us to make a profit while we can.