You need to study and analyse the crypto market before you make a move to sell your coins. When the market recovers and prices increases, you sell.
yes and if you feel profit, you have to sell it before the price drops again and you do it quickly, if you lose that moment, you might regret it.
market movements can change at any time and can move quickly so you have to check frequently if you want to buy or sell so you don't get stuck.