OP, I empathize with you wanting to make more of a difference. I feel the same way, but am hindered by the fact that I am an ex-pat American in the UK , and cannot afford to be targeted, doxxed, or arrested because of a real possibility of losing my residency and being deported. And, until very recently, this would have been a real possibility. I would like to be out there protesting! It's very frustrating not to be able to do more.
So what I do is keep myself informed, spread the word anonymously as much as I can, fund court cases when I can do so anonymously, and stand up for myself and other women when it matters.
I am fortunate that I also have a lot of money, so if it comes to it, I am prepared to take anyone to court here in UK if my rights are denied. I hope it won't come to that. At least the law is on my side here.
It's not enough, and I can't even talk to my family about it because I have a trans-identified niece who has been caught up in this, hook line and sinker. It's depressing. But, I'm gathering the evidence and arguments for the time if/when she decides to detransition, and I'll be there for her, as I have been throughout her life.
What you are doing in Australia is important, and impressive, given the state of the "freedom of speech" in your country right now. Much of the US is the same at the moment, and one reason why I wouldn't consider moving back yet.
Keep writing letters and informing yourself. You never know when you will need to stand up for yourself or others.