Guide for Smartphone privacy?

Hi. I currently own a Google Pixel 8A Phone.

I Flashed this with Graphene OS A while Ago, and been using it since.

I Have a Query.

What is the best and most simplest way to make it a locked down phone, avoid tracked and monitoring by officials and corrupt officials... Like I have beef with local corrupt feds level.

I Want to make it a Safe private and hardened phone. Make it a Safe phone, privacy friendly phone.

How to achieve this?

Thanks.