sorry to hear that! I think my strategy would be to identify where specifically in ‘space systems’ you want to work - to me space systems sounds quite broad, so what specific work are you interested in. From there maybe get an engineering job with analogous skills in industry to build up skill and experience.

I’m Canadian so I don’t know about Australian Aerospace, but I’m guessing they don’t only recruit fresh engineering graduates so there must be another way in.

Another benefit is that I find using the same skills across different contexts gives you diverse work experience and broadens your imagination a bit which I think on the whole makes for better engineers.

I don’t imagine any of these strategies as better or worse but if I was in your position this is another way to get to where you want to go.

All the best!