Hi Nahin1985,
Welcome to the Lenovo Community!
I'm sorry to read that you're still unable to get the Android 13 update for your tablet. Though, please note that software updates are typically rolled out in phases, and it's possible that the Android 13 update for the P11 (2nd gen) tablet has not been released in Australia yet. However, I'll check this with our team and get back here as soon as I receive a response from them. In the meantime, see if you can search for any updates on the tablet by following the methods in this link.
Other than that, please provide here your tablet's current firmware (ROM) version by going to Settings > System > About tablet for us to check.
Thanks,
Adriel_Lenovo