When I really can't help but buy at the bottom, I take a look at the indicators on the K-line. The SAR is still above, the MACD has crossed down, and the relative strength index is still quite weak (<30). The J value is also very small, so I held back and haven't made a move yet. This is a judgment method suitable for right-side trading; it definitely won't catch the lowest point, but it can largely avoid the possibility of catching a falling knife. For reference only, DYOR $BTC