When we invest, it is easy to hold on to a losing target, but this is meaningless. Although it is painful to cut off your flesh, it is better than continuing to wear yourself down. Each share of funds is independent. Further purchases of targets that have already suffered losses will not increase costs, but expand losses. For altcoins other than BTC, be sure to move in and out quickly. There are not so many stars in the sea, they are often short-lived.