You may get more offers if you tell people where you are sailing from, how much time you have available, and preferred
route.
The majority of yachts arriving in
Australia come across the Pacific. The best place to pick up a ride is probably
Panama, followed by
Mexico,
California,
Galapagos,
Tahiti, but you can also pick up shorter rides from
New Zealand,
Vanuatu,
Indonesia etc.
Check the various crew websites.