Back in 2017 I started making a map of all the decent (and ok) biketrails and back roads around Sydney. It is hosted in Google My Maps
Start using the Sydney Map here using this link
Using Layers
It really is a good idea to study trails on a bigger pc and not just type an address into Route Finder app and then complain that there are too many cars or it is too steep.
In this google map, the layers are sorted according from very roadie(black grey) to back roads (green) to very shared path (purple).
Start using the Sydney Map here or go to the places referenced in the video Iron Cove or Chipping Norton or Salt Pan Creek or read about the Fernleigh track North of Sydney here