Personally, I think it's better to sell the fund that lost 20 points and then buy it at a low level, depending on whether you choose the right fund. This is the same as stock trading. Many people buy stocks regularly when they keep falling. Reducing costs is only a means, not an end. The purpose is to get the money back faster when it rebounds. If the stock fails, it will only lead to greater losses. Similarly, if the fund loses money, if you think there is a good chance to return to the fund in the future, you can continue to invest, and vice versa. The other is that the investment money must be idle money. If it is urgently needed, it may be sold in advance before the rebound, which will also amplify the loss.

The fund can lose 20%, which means that the fund you invested in probably didn't outperform the market index. As we all know, the market index is often lower than ten years ago, which means that you may still lose money after ten years of investment. Therefore, it can be judged that the performance of the fund you selected is relatively poor.

Bad funds should be disposed of at the opportunity. If you want to continue investing, you should also invest in better funds. After all, a better fund will always make more money than a poor fund in the long run, so it is more reasonable to change to a good fund.

If you want to make a fixed investment, you should also choose funds that can make long-term profits. At the very least, you should make sure that the fund manager you invest in does have strong investment ability, either below average or at a loss.

Fixed investment funds are not so complicated, just need to know how to judge the investment ability of fund managers. The easiest way is to find his investment performance over the years, and the poor performance will be very obvious. The measurement time should be set at more than 5 years, and the investment performance of more than 5 years is basically good. Fund managers who do not have five years of continuous performance can choose not to vote. Because there are always fund managers who have done well for more than five years, there is no need to choose a new fund manager, unless you know a fund manager with less than five years of investment experience and can judge his ability without records.