How to optimize a website for a specific country?

Hi,
Am doing SEO for my site for the last 2 months and didn’t get listed in any of the pages on Google.com.au organic search. The keywords I used are “web designers melbourne” and “web designers sydney”. I want to optimize this site specifically for Australia. What step do I need to follow to get listed on the Google search results? Please help!!!

Thanks,
Pius.
web designers melbourne