By selling the target income in batches, investors set an expected rate of return. When the fund reaches the expected rate of return, it begins to make profits slowly, either according to the cumulative rate of return or according to the annualized rate of return.

For example, if you hold Fund A and the expected return is 30% annually, then when the return of Fund A reaches 30%, you can sell half first, then sell half when it reaches 35%, and then decline. When it falls to 20%, you can choose to redeem it all.