Whenever there is a decline, you can place orders in batches at the "second support" and "third support" in the daily K-line in advance. Generally, after breaking through the first support of the daily K-line, there will be a pin-shaped rebound, and it is difficult to go down directly.

Then I am not asking you to place a 100X order there, which is also a low-multiple contract or spot, which is equivalent to a small risk to bet on an oversold rebound.