I am in Australia as well, I started on a similar base as you. I told employers that I was willing to learn and do anything. Most the stuff I have worked on is back-end services.
2010 - 25yo - 41k - First job - .net dev (internal services / sql).
2011 - 26yo - 41.1k
2012 - 27yo - 65k - Second job - job advertised as .net became pseudo COBOL dev.
2013 - 28yo - 80k - moved more in to tech lead / manager role.
2014 - 29yo - 86k - Third job - .net web dev (webforms / mvc).
2015 - 30yo - 86k
2016 - 31yo - 163k - COBOL / .net + odds and ends
2017 - 32yo - 163k
2018 - 33yo - 170k
As others have said, technology really isn't the thing that will drive your increase in remuneration. It is understanding client requirements, creating business solutions, being able to communicate said solutions.