If we all hold for no particular goal then we miss the opportunity to sell. If I see the price of the altcoin I held looks good, I'm selling. There is no point in not selling, we hold, and at the right time we will sell. The planning I'm doing isn't really difficult because I'm doing almost nothing while waiting to sell the right price. I also sell altcoins to add bitcoin to my portfolio from time to time
It seems that some people have lost sight of what is the purpose of holding your coins, holding is a great strategy without a doubt but most people forget that at some point you need to stop holding, you need to sell your coins if you want to obtain profits, and in my opinion one of the best moments to do that is when the coin in which you have invested has reached a new all time high, it is true that you could miss some profits in the process but that is to be expected.