This month's fund ups and downs have nothing to do with previous months' ups and downs, and this year's fund ups and downs have nothing to do with previous years' ups and downs.
This kind of data shows that when we buy funds, we can't see the ups and downs. Everyone rises in the bull market and falls in the bear market. So it may be more reliable to buy a fund to see its relative ranking in the same category. If a fund has been in front of similar funds for 3 or 5 years in a row, it means that the performance of this fund is good.