Since it is necessary to adjust, it will certainly have an impact, but doesn't it cost money to purchase and redeem?

The adjustment range may not be as much as the loss of your purchase and redemption, and the investment fund should look at it from a long-term perspective. Unless you believe that there will be a sharp adjustment of more than 20% in the market, there is absolutely no need to redeem the fund, and the fund should never be speculated as a stock.