If the fund loses 20%, whether to cut the flesh or pretend to be dead depends on the individual investor's understanding of the fund and his or her psychological tolerance. A fund is a long-term investment. You don’t just buy the fund for a month and then sell it based on how much money you earn. This is called fund speculation. There is also the question of whether the money to buy the fund is spare money that has been idle for a long time or is borrowed. After all, the interest rate on a one-year deposit is just over two points. So first ask yourself whether buying a fund is suitable and whether you want to invest for the long term. The fund loses 20%. It would be unwise to cut the profits. At this time, the profits are almost at the bottom, so neither cut the profits nor pretend to be dead. Instead, buy some more stocks at the current price to reduce your own costs. With time, wait and see. Once there is a profit, sell the result.