In my experience, a bullish engulfing pattern is most reliable when it appears after a clear downtrend, ideally near a support level or after some oversold conditions. The bigger the second candle, the better — it should completely cover the previous one and close near the top. Also, I use the
bullish engulfing pattern in confluence with other tools — for instance, if there’s a bullish divergence on RSI or a rising trendline nearby, that’s usually a strong setup. But context is everything — in ranging markets, this pattern can be misleading. I prefer using it on daily or 4H charts, not on lower timeframes where there’s too much noise.