Me personally would use Fibonacci retracement, how bout you?
Fibonacci makes sense when it comes to using only one indicator, but I prefer using RSI over Fibbo retracemet, especially when I set the RSI period this way-
15 period for oversold and 85 period for overbought, the accuracy is like 70-90 positive results and works best in higher times frames, 4HRS, D1, W1, and M.