Hi Rakuu,
The good news is that you've cleared the prerequisites for a nursing degree at each of the 3 big universities (UQ, QUT and Griffith).
Now if you think that you won't get the ATAR that you need in order to get into any of these degrees then there is no need to stress.
You can spend one year doing a degree that your ATAR allows you to get into and then you can transfer into a nursing degree. I suggest that you do a degree from any of the other fields that you got interested in before (IT, architecture, business).
This path is the most common one according to my knowledge.
Also keep in mind though that currently we don't know what ATAR rank any university degree needs (as the first cohort to graduate under this new system hasn't been assessed yet completely). This means that you might not need to worry about your path into university as well.
I'd also recommend that you use the ComparED website to compare which university gives you the best experience. This data is collected by the federal government through surveys that university students complete annually. The university students are surveyed on how much they would rate the: overall experience, teaching quality, skills development, positive interactions with teaching staff, happiness with university facilities and satisfaction with support services (of their university).
https://www.compared.edu.au/I hope you find my tips to be helpful
Good luck with everything,
Kind Regards
JerryMouse2019
By the way, QUT has the best business degrees and IT degrees (I've seen their business school and it's well renowned and practical) (Their IT degrees are really practical and they teach IT in a way that works for people who have no previous experience in IT at all). I have a friend who is doing architecture at QUT and he says it's amazing as well (the ComparED website backs his statement).
Also I checked out nursing on ComparED and apparently Griffith has the best overall experience out of the 3 big universities (with QUT coming in a distant second). I'd also like to mention that UQ wouldn't be the best option as UQ is a more theoretical research based university. They focus more on the theoretical work (assignments/exams). They focus less on the practical skills that help prepare you for your job.