Yes, greed is the thing that makes most traders lose money at the end. Therefore, it is essential to set a reachable target before buying a coin, and sell it when the target is met.
Greed is more influenced by emotional factors, namely getting as much profit as possible in the shortest possible time. It is this factor that makes the profits that have been obtained eventually disappear because they want to get more. Most realistic there must be a profit target, so that when the target is reached, sell and enjoy the benefits.