It makes no sense to keep holding coins when you are already in profits, even if the coin is a very good one you have to sell and wait for dips to buy back, this will bring more profits and also increase the numbers of the coins in quantities
That is what we called trading and we have to sell our coins for a profit than miss any opportunity.
I have experienced before, I hold coins and never sold them even ATH but I realize that I was wrong, I reject the chance that I can double my money, really disappointed with the results. May holding happen during the hard times but actually, many people had made it right. However, if we are into the look to make a profit from time to time, making a trade is somewhat we need, not holding.