I would declare independence from NATO/Five Eyes, ally with China, remove US military bases from my country and then immediately change the date of Australia Day to 9/11 as a joke
I would then start de-desertification and other environmental projects, and start improving infrastructure too.
Foreign & defence policy: Cut ties with US and NATO. Stop the fighter jet purchase. Coordinate defence with Sweden and maybe other Nordic & Baltic countries. Improve relations and trade with Russia. Stop the export and import of weapons (expect maybe with trusted allies). Develop nationalised weapons industry. Change the current, sexist conscription policy to include people of all genders, but stop punishing people who refuse to serve and increase the standards of who's fit to serve. We could use smaller, but more motivated and better equipped defence forces. Chance military training to emphasis only on defence and helping civilians.
Environment & infrastructure: Make a clear roadmap for quickly abandoning fossil fuels and peat. Agressively research and build nuclear and renevable energy. Protect the last natural forests. Cut funding for highways and airports. Invest heavily into both light and heavy rail transport. Declare that cities should aim for dense, walkable mixed-use development. Build publicly owned, wooden apartment houses.
Other: Nationalise banks and key industries. Improve mental health services. Legalise cannabis and decriminalise all drugs. Create jobs with massive infrastructure projects and investing into public sector. Increase research and education funding. Stop funding animal production. Develop healthy and sustainable, mostly plant based diet fitting to arctic conditions.