Do you have a target to sell your coins? Greedy means you are too ambitious to get bigger prices of your coins even if the target on your coins already meets for selling. Moreover, if you are aware that the price is already on top of the current increase, but you still want a bigger increase. Then, finally, you sell once the price dropped in a big number later. This is the description of greed, but if you don't do it, instead you have reasonable factors to continue holding, it is not greedy.