Once more thing
@Kris-MK - a number of the ‘good’ trails and bike parks close in our winter. You might scrape in a ride at Lake Mountain (cascade trail is great) or Mt Buller but they will be closing around the time you arrive. Also Maydena in Tas will close around that time. Others will know exact dates but it might depend a bit on weather.
Bright and the Mystic park are open year round as are red hill, silvan etc but there are some trails to avoid when conditions are sloppy.
Also, please note no one has suggested riding at Lysterfield. You will undoubtedly see it on Trailforks ect and note it is close by in the eastern suburbs. It is generally pretty flat and very packed with people as it is close to where a lot of people in melbourne live.
It can still be fun if it’s your best/only option but there are other places more fun.