Bisq 1&2 (both desktop applications available from https://bisq.network) will have some limited AUD liquidity, expect to pay 5-10% over KYC price.

Robosats has close to 0 posted AUD liquidity but I suspect if you bid 5-10% over KYC price, someone would get an alert and take it.

If you are based in Australia I would recommend trying to get to some in person meetups and build a network. Get to know people in the community. I'm sure once you've shown you aren't a fed, people will be willing to do some P2P trades.