If you can already make a profit, it is better to close the trade or investment as soon as possible because the next opportunity is not necessarily the price that can rise higher than what you have seen.
If you hold it still, you may see a decline or correction and there is a possibility that the price will go back down to its original price.
If that happens, you have to wait a while until the price can rise slowly and you can only withdraw your profit.
They are valuable lessons from what happens to other people and we must avoid them if we are to take advantage.