Recommend two ratio strategies, at the end of January, a 1:3 ratio spread near one standard deviation. The win rate of the call ratio is higher, and the returns are also greater. The profit curve is for reference.

Strategy logic: Outside of one standard deviation, it is difficult to break through the far leg, thus the returns are all positive.

At the same time, the risk is smaller than that of a double sale and can be adjusted at any time. Huge wide fluctuations may bring excess returns.