Hiring a SEO content writer who is actually based in Darwin changes the work in ways an offshore hire cannot copy. Australian buyers research hard before they enquire, and they can spot imported American copy in a line. Seasons run opposite to the northern hemisphere, so the retail peak sits across a hot Christmas and a January reset. Local proof, local spelling and clear pricing matter more here than volume.
Practically, that means your SEO content writer writes in the spelling, currency and legal conventions used across Australia, references Darwin and wider Northern Territory accurately, works inside your hours so a question does not cost a day, and quotes in AUD. Languages on the bench for this market: English.