You don't have to hold an investment asset forever without considering selling when your target is reached, but selling on a downturn is a bad choice. Even if you still keep a few percent of the profit from the initial investment value, selling during a correction should be avoided. This advice is useful for you and others if you want to get returns, but you will have to wait longer to get returns if you don't accumulate during the price correction.
If you have a budget, then accumulate during corrections. Although I do not guarantee your profits, this approach allows you to generate returns faster than before when the market recovers. Taking advantage of volatile markets is desirable, but only if you have the budget.
One of the most difficult things in trading is when you buy a coin and you are making a small profit, but you can't stop yourself from selling and holding the coin until it goes higher. You have set a target where you have to sell, and sometimes it also has a disadvantage that the market is going up and you are getting a little bit of profit, but suddenly the market goes down a little bit and the little bit of profit that you were getting is gone. From where you bought the coin, it goes back to the market and goes back to the same place.
If you hold it, you will get a big profit at the same time, but you will miss out on small profits. They say that to get something big, you have to sacrifice something small, in the same way, to get more profit, you have to give up a little profit. These are the rules of the market and the one who learns all these rules and tricks becomes a successful trader.