Would you sell your entire crypto right now with 500 percent profit?
Just go to coinmarketcap and see the chart history of several altcoins in the past 1 year! I am sure you will not hold it any longer, because we are sure the price will drop back to the beginning or deeper than before. So for me, instead of holding it for longer, it's better to look for other potential coins.
If the coin you are holding is not among the popular coins of the crypto market and has very bad history of dumps, then of course it would be great to get rid of it as soon as possible. But if the coin you are holding onto is bitcoin, then there is no way to get it out of wallet right now and selling it off. Soon the coin is going to pump hard.