If the coin I am holding increase in value, I lock the profit I gain and convert it into a stable currency like usdt. When I piled up and reaches a desired amount, I convert to fiate and buy a bank investment
I think the most important thing is to understand when to sell, because you know that a lot of people are too greedy to wait too long when prices go up, even if they sell before they're already profitable, because greed just makes him miss the opportunity, the first you have to know when you should sell and second always withdraw your profits to a safe place like a bank account