As a former RAAF QFI I saw several students that were scrubbed on Pilots Course who went on to become highly experienced airline captains on big jets. Some of these RAAF students were scrubbed because they had the bad luck to have lousy instructors whose instructional "technique" was to shout and scream to their students. In those days instructors were not held accountable for student failures and no questions were asked. Hopefully that has all changed but the main thing is to put that all behind you. 150 hours of RAAF flying is a good start to a civvy pilot career. As someone advised you earlier, staying on with the RAAF in another mustering if that option is available to you, helps build a good bank account and a secure future for as long as you wish to stay.
But if you want a flying career (rather than just recreational flying) then the sooner you start the better. That means leaving the RAAF now and going into full time training towards a CPL and instrument rating. The financial risks are great but the RAAF flying training will have helped you greatly with confidence and ability. You would not have got to 150 hours in the RAAF without being a pretty sound pilot. If you are totally enthusiastic about flying as a career then sitting behind a desk in the RAAF at your age is not the way to go. At least with your current flying experience you will be able to spot shonky instruction in a flying school before you get up to your ears in debt.