The reason for restricting arrival numbers is a lack of secure quarantine space. As events have now shown, capital city quarantine hotels are not leak proof.
So here’s another perspective to consider beside your own needs. There have been severe lockdowns and restrictions forced on the residents here in order to very nearly suppress the virus. Why would you expect them to throw away this sacrifice so that expat Australians can arrive willy nilly - with enhanced likelihood of bringing yet more variants of the virus here?
As a former expat for over 35 years, I never once expected to be rescued by the government. We always had funds stashed away for contingencies along with Plans A, B and C. Everyone I knew and worked with did the same. Once you become an expat, you’ve left the system and shouldn’t really have any expectation that the very system you’ve left should come and rescue you.