Today, reflecting on the pain, I listened to a brother's suggestion in yesterday's comment section: it's true that I can't always catch the bottom, so I will gradually add to my positions. I have indeed been too greedy; both catching the bottom and trying to escape at the top are manifestations of greed. It's better to capture profits that suit my abilities.
Currently, I am only trading SOL, as having too many coins spreads my focus too thin.
There have been several large bearish candles on the weekly chart. Last week closed bullish, and the larger range is basically set. I have a significant position and will exit completely upon a rebound. If the V-shaped recovery breaks the previous high, I will wait for a pullback to re-enter. If it drops back, I will still buy around the current price. If it breaks down further, I will hold on and wait for a rebound to exit at the breakeven price.
This time, I will strictly follow my strategy and cannot act on whims anymore.