As mentioned above you are probably going to need to take a step sideways before you can step forwards. Most of the people I know who drive twins made the break by progressing though a company that has both singles and twins. It might take a bit of time, but if you do your job well and get on with your boss and coworkers, it will happen.
You will almost certainly need to look further afield than Sydney, Melbourne etc. Pack the car and head out of your comfort zone. You will be surprised how much fun you can have…