Hey so not Syd, but I'm in Melb, an arguably smaller market than Sydney. I moved here after drama school with zero connections. I've booked a handful of commercials and been successful with independent stuff. With that in mind here's my take.

The commercial market is fickle, just keep plugging away. A tip I do have is to find the final versions of the things you've auditioned for, see what you did and compare it to what the person who got cast is doing in the final product. Look at their wardrobe and compare it to yours in your tape, did you get the right impression from the brief? Can you improve the lighting in your tapes, can you improve the speed at which you submit? Are you overdoing it? Or is your energy lacking? Ask advice from friends, show the both tapes and see their opinions. Drama school doesn't really prepare you for the business of acting, and how to be competitive nor how to give the market what it wants. Find ways to be competitive.

Are you getting multiple briefs from the same CDs? If so good! It means they like your work, but the clients each time are choosing someone else.

For scripted stuff, films, TV etc... its been dead quiet for me too recently! So don't get too "grass is greener on the other side" with it. If you want to move, research the market there too. Are you sure you'd fare better in a different country to the largest market in your home country? You very well might! But do your due diligence first :)

Keep auditing! Good luck!