We never tried the herd immunity approach, we went into lockdown as soon as we had a few cases. The nationwide lockdown was a success.
One state is now seeing the virus spread rapidly. Victoria. Some states have virtually eliminated the virus and Victoria is likely to see its state borders closed for the foreseeable future.
There is no room for complacency and this is far from over. I think there is a light at the end of the tunnel but it will be a multi-pronged solution. Masks, vaccine (hopefully), anti-viral treatments, changes to how we live and work and travel.