Hello, I did a mistake during the high pump of bitcoin cash few days ago and I bought bitcoin cash for 1800$. Since I'm blocked on it because I don't want to do a loss by selling under 1800$...
My initial plan was to invest in differents altcoins... I think it is a good example of emotional trade

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Do you think it's a better idea to go out now or in few days when there will be a little pump OR to hold Bitcoin cash for a long period and forget my invest in others altcoins for the moment ?
Just keep on holding unless you really need money right now. Let's have a wise decision making here in order to have more profit in the future. But in the end it's still your choice if you wanna get under $1800 or more amount of money. And also keep buying altcoins especially if there are price drops and do a long-term hold with them.