I'm an Aussie living in the EU, and if anything is going to eventually tempt me to go back it's going to be ridiculously cheap solar energy. I think the odds of building any kind of utopia there are pretty remote but I think massive scale green steel smelters (+ other metals), green ammonia facilities, and expansion of desalination (combined with indoor agriculture). If Aus doesn't completely fumble the ball, I think there's a really good opportunity for another "mining boom".
Had a lot of fun listening to Saul Griffith explaining that solar energy and electrification is inherently deflationary: https://www.youtube.com/watch?v=zFr87rZyr3o