I haven’t been to Australia, but I’ve run in Hawaii, which is part of Oceania (broader than just Australia).

Come to Australia! It's a great place to run!

Or NZ at the least. Hawaii isn't on the content. You've got only one continent to go before you can check that box.

I have 100% confidence you'll do it!

I ran every day for a year, and kinda wished I had kept going (though I only managed 3 continents in that year).

Notably not on the tectonic plate Australia is on (which is mostly although not entirely just Australia in terms of land), though, if someone is going by that definition.

Eh, that doesn't really count. Sounds like a good excuse for a trip ;)