Hiring a email copywriter who is actually based in Canberra 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 email copywriter writes in the spelling, currency and legal conventions used across Australia, references Canberra and wider Australian Capital 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.