Someone built a tool to find your local MP and contact them about saving Medicare Bulk Billing in seconds:
https://www.reddit.com/r/melbourne/comments/x148sr/i_built_a…
The tool itself: https://saveourmedicare.com.au
(disclaimer: that someone isn't me, but it sounds like a good idea to me).
This will just come across as spam to a local member and most likely be ignored.
If you are truly passionate about this topic then personally get in contact with your MP and express your concerns.