But you can use custom ROM with latest Android 12, this requires to root your phone. You can find tips/info on how to flash custom ROM for your phone on XDA Developers site.
Rooting your phone is risky, proceed with caution.
Hello there Tatin_24,
While it's true you can run a custom ROM on your phone instead of waiting for official updates, we still don't recommend it as you may be opening your phone up to a few problems, such as buggy performance and the potential to brick your phone.
What are the pros and cons of a custom ROM? - Quora
Please proceed with caution. Thank you!