A failure of manual trading

March 16, I shorted ~0.19 BTC at 40300 USDT (worth 8000 USDT), then the price goes straight up to 48000 USDT. By that time I could lose up to 1500 USDT but I decided to hold and wait.

April 12, the price drops and I close the position at 39666 USDT which generates a profit of 125 USDT. It took me 27 days to close this position with the risk of been liquidated. The final APR is around 67.5%.

I tried a simple grid trading estimation; it is way safer and simpler to achieve the same APR. I should be writing an automated bot to do the trading for me instead of trading manually.