Looking back, I still believe the direction and approach are correct. I used the easiest-to-understand diagram to analyze SNDK's trend range. If SNDK revisits the upper 2200 range, I will short again around the upward trend line area.

This trade's main impact on the return rate is the breakdown signal below 2000, which prompted a short position at 2036 as the initial main position, and due to the uncertainty of the 2300 breakout signal's authenticity, I did not add positions to average down.
This resulted in at least a 10% profit reduction, shrinking to 1%.