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.
you cannot know in advance which coin will be truly potential. only a very correct analysis can tell you. if a person does not know where to invest correctly it is better to let him hold what he has and does not sell