What should I do when I go back to Australia to visit my relatives?

It depends on what kind of visa you are applying for. Recently, most visas granted by visa officers are more than one year, and they need to come again every three months. If this is a visiting visa, it doesn't matter if you come back from Australia. You can buy a plane ticket and go within the validity period of the visa.

In the past, visa officers issued three-month entry visas. If that's the case, you'll have to reapply for a visa when you come back.

Can you upload your visa page? I can explain it to you after reading it in detail.