For AUD/USD, the average liquidity in pre-COVID market conditions is about double the average liquidity in recent market conditions.
In the recent market conditions, the average liquidity for AUD/USD is highest around London close and New York open. This is similar to pre-COVID market conditions.
Liquidity in AUD/USD drops off sharply between 21:00 and 22:00 GMT (going into New York close) in the recent market conditions, relative to pre-COVID market conditions.