The stock has plummeted, so we can't short the stock at present, and it is difficult to make a profit. Futures and foreign exchange can operate in both directions (that is, they can make money by judging the right direction regardless of ups and downs), and have little correlation with stocks. According to the 20-year survey of stocks and futures by relevant American institutions, the correlation between futures and stocks is very small. If about 20% futures are added to stock funds, the systemic risk can be greatly reduced.