That is a question you will need to ask Asus Support why they don't have Windows 11 drivers for your laptop.
It isn't that old unless the laptop isn't supported by Windows 11 due to its processor or other hardware installed not being supported.
If you APU isn't supported by Windows 11 then Asus isn't going to post any Windows 11 drivers. But once you post your APU maybe AMD might have newer Graphics driver for your laptop.
What is the APU and GPU you have installed in your laptop?