You quit too soon
There are many people who are carried away by their emotions, withdraw their money earlier than expected, you cannot stop being carried away by your emotions when you see that an investment is going down and withdraw it, you must follow a plan of what would be your strategy to use if a security go down or go up, and stick to it. It happens in the minds of people who pass by that they must buy fast because it is going up, Po sell fast because it is going down, leading them to buy high and sell low.
This is the mistake I made the most.
here in Brazil we have a term that refers to this type of error, and it is:
"Mão de alface"
Lettuce hand is translated.