As in, transferring to a new degree? If you only complete 0.5FTE years of study, a GPA of 7 still won't be competitive enough - you need to complete a full year of study first. I'd agree trying to boost your GPA is a good option, and resitting UCAT and aiming for a higher score (even though your current score is already very high) and applying to the dentistry unis again next year would be a good bet. Also try and develop a strong written application for JCU.
You could also pursue graduate entry further down the line if non-standard entry doesn't work out. Good luck and sorry to see such a strong score potentially still not being enough! It's such a tough game.