Before investing in a fund, investors should have an expectation of the return on investment. This expectation is not determined casually, and the profit point should be set according to the type of fund invested, historical performance and your own investment expectation. For example, if you invest in stock funds, if the yield reaches 20%, you will choose to redeem them all. If you continue to be optimistic about the future trend of the fund, you can choose to redeem part of it and keep the remaining share.