I can say so, I keep my altcoins until the price of profit does not suit me. In most cases, I try to sell some of my coins. For example.  I have 1000 coins, which begins to grow on the stock exchange. She made x2 today, I'm selling 25% at that moment. Tomorrow the coin raised up, I sell another 25%. Total my profit x2+x4=X3 I think this method is the best and safest for many investors.