fwiw - Although Sydney is 'falling' the last announcement was a .1% fall and the total is less than 2%... Melbourne is still up 7%+ last 12 months but as it is now within about 10% of Sydney it will flatten too, but we still have 100,000 people moving here (Melb) every year, so don't bet on a big reduction. Brisbane is about 30% behind, so it will grow materially in the next 2-3 years as people move there for the cheaper living - that's my bet - and my brother just bought a house there and he has always been lucky with his timing! I read a recent study on the ultra wealthy, and rather than talent or intelligence, most got there due to good luck! so don't overthink it
Disclaimer - I cannot predict the future - so good luck if you follow this advice!