Depends on your accommodation now, if you have cheap accomodation buy a rental, claim the interest as a tax deduction, do the DIY repairs and maintence on the place yourself, buy where you know the market, not some random far away town.
Maybe spend some on a better education PHd, Masters or whatever ? Should lead to higher income going foward.
Put some in Super and claim the deduction (check how much you can for your concessional contribution (current concessional cap- employer contribuitons = max amount) , nothing else like it to turbo charge that amount ; time and compounding interest and it reduces your tax by claiming the deduction amd forces you not to take it out.
Be frugal, keep saving and investing.
I started at 19 with shares and retired at 40, am now 60. So it depends what it is you want out of life ? i wanted my time to be mine to do as I want, i also had zero interest in having kids. My only regret in life was not retiring earlier. It really depends what you want out of life as well, ie buy a flash car, or whatever ?
I am NOT a investment advisor, so grain of salt.