When the fund falls, you can reduce the cost of holding positions by adding positions. When the fund rises, adding positions will increase the cost of holding positions and is not suitable for adding positions. Fund cost = total amount of each subscription/total number of shares-handling fee.

Generally, you can see the cost price of the position in the fund position. Generally, the net value of the fund is higher than the cost price of the position, indicating that there is profit. If the net value of the fund is lower than the cost price of the position, it means that there is a loss and you can add positions in batches.