You can directly sell your IOTA for AUD on Coinspot (Referral link).

Coinspot directly pays your Australian bank account. To sell your IOTA, you will need a Coinspot account.

Head over to “My Account” and link your bank details. Then go “Buy/Sell”and sell your IOTA.

Head over to your dashboard after and click withdraw funds. You will then be able to extract AUD from your account but note withdrawals may take a couple of days.