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 ?
investing in altcoin is a smart choice to make more money but do not invest in altcoin outside the top 250. The altcoins outside the top 250 are the weak altcoins and have no strong growth potential. In addition, you have no profit whatsoever holding it.
So I think you should find good altcoins in the top 250. Your investment strategy is pretty good but requires thorough analysis. Anyway, good luck to you.