GBPAUD BUY-SELL SETUP

After the price react with a weakly POI and form a 4h donwtrend, the price come to a daily POI and form a Wyckoff. In that Wyckoff I want to do a a buy from a 3min POI and then sell in a 15min POI (the price should have a minimun retracement of 50% from 4h timeframe downtrend).