AUDCHF Engulfing

We can see in yellow candle, its a bullish engulfing signal which I program in Pine. In this signal there is a potentially position to open, with the scenario based on Fibonacci Retracement .

Scenario
OP : 0.6510 - 0.6520 (38-50) percent
SL : 0.6478 (0) percent
TP : 0.6612 (168) percent