According to the trend of the fund, for example, when the theme of the fund is about to end the downward trend and start the upward trend, open a position.

Control its position reasonably, don't buy all positions, and leave enough funds to prevent the risks brought by the late trend of the fund's net value. For example, if the equal purchase method is adopted, that is, the amount of each purchase is the same; Equal-difference buying method means that the amount bought each time becomes equal.

Set a stop loss position after opening a position to prevent fund risks.