Brisbane search is less saturated than Sydney or Melbourne. In a lot of categories the first page of Google still has gaps, which is unusual for a capital city. It means the cost of ranking is lower now than it will be in a few years, and a business that puts the work in early can hold a position that later arrivals have to fight for.
The 2032 Olympics build-up is part of why that window is closing. New businesses are setting up, established interstate operators are opening Brisbane offices, and demand for services is climbing across the whole city. More competitors means more people doing SEO, and search results fill up. The advantage goes to whoever started sooner.
We are not promising the Olympics will make you money. We are saying the search results in your category are more winnable today than they will be after another two or three years of new entrants. If you have been putting SEO off, this is the argument for not putting it off any longer.