The price clearly returned to my entry price, so why did I still end up with a small loss after closing the position?
Averaging down only makes the average price look better; it doesn’t reduce the risk of the entire position. The larger the position, the greater the impact of the same price movement.
The first page of my personal study notes says: Understand it before you act.
Before opening a position, calculate the liquidation price. If it’s too close to the current price, reduce the position size.
$BTC 75056.01(-1.08%)

Just talking it over—whether you make money or lose it, you have to bear the consequences yourself.