There are two possible scenarios to buy the AUDUSD pair.
Scenario 1: Wait for the price to enter the BUY ZONE on the H1 chart, wait for the divergence to complete itself (MACD tick up) and a bullish candle pattern to appear - then buy.
Scenario 2: Drop to the M15 chart, wait for the price to enter the buy zone, let the price create a false break, then break above the most recent high, and only then buy during the correction.
Protection in both scenarios should be below last low created.