We are postponing a Nov 2020 trip to Australia because of coronavirus-related travel restrictions. I have two visitor visas (subclass 600) that expire in early 2021. Our plan is to resurrect our itinerary for Nov 2021. Can we get a free extensions so we can use our tourist visa later in 2021? These visas were costly so if we have to reapply/repurchase, we may skip our plans to visit the country.

I was unable to find the answer to my question online so I am hoping someone can help me. Thanks.