Why should I care? That is not a snarky attack on your world, but a piece of advice that a lot of sci fi/fantasy writers miss. Everybody knows Ringworld, nobody knows The Smoke Ring, despite both of them being Larry Niven. The Smoke Ring is a much more interesting storyworld, constructed with a great deal more care... but Ringworld has Louis Wu, Teela Brown and Speaker to Animals. I think you have enough of your world that it's time to figure out who you're going to put into it and why your readers will care. Because in the end, it isn't an intricately constructed storyworld that hooks readers, it's your characters' interaction with an intricately constructed storyworld that does the trick. Pos-apocalyptic Australia only gets you so far. You need a Road Warrior to tie it together. Otherwise it's just Steel Dawn.