As a long-term investment product, funds can be used at any time in most cases. Timing should be considered only when the whole market is at the upper limit of reasonable valuation.

Of course, if we buy a fund with excellent performance and buy it when it falls, it can help us reduce the cost of holding positions so as to get more income later.

In short, when we buy when the fund falls, we must expect that it will rise behind it, so that we can buy more and more when it falls.