I will add for the factors is the emotions. Emotions is the cause why you are greedy in every trade if you have a profit you want to sell directly to prevent from the dump of the price. The emotions is controlling you to will not hold a coin because in your mind it will dump.
I think you misunderstand greed here. Greed means that you want more and more of something. In this case it is money or to be more detailed Bitcoin.
So when you see that a trade is green and you could take profit now you think "no I want more profit, I will sell for a 10x" and you do not take profit.
Then the coin dumps and is red again. You did not make any money because you did not sell.
This is one way greed in trading can hurt you.