I think it's not greed but your mistake in doing a trading strategy. If you trade every day, you must continue to monitor the price of the coins you have bought. So when the price seems to be going down, you can sell it. But if you are stuck in a loss. Better to remain patient and do not sell coins because the price of coins will definitely rise again.
Greed is a big problem and it's within your emotion.
When making a strategy, it's just all written plan, you cannot do it effectively if you are greedy, therefore a person who
are not good in controlling his emotion will most likely fail in the long run.
Trading does not give instant money, it 's a long term process to be consistent.