Google Pixel hardware is focused on providing a private relationship between the user (your data and behavioral patterns) and Google.

Depending on your threat model you can flash custom roms to enhance your privacy and security posture.

A lot of folks here seem to be of the "...just flash GrapheneOS and you're good..." crowd but it's not that simple and there are trade-offs that impact usability and user experience.

There are a lot of interesting projects out there to choose from. Best advice is to work-up your real world threat model and do your reasearch.

You may find Louis Rossman's experience with GrapheneOS relevant: https://www.youtube.com/watch?v=4To-F6W1NT0&t=1

Here's a few links to help get you started - there are many android projects. I am not affiliated nor am I explicitly endorsing any of these projects.

CalyxOS https://calyxos.org/

LineageOS https://lineageos.org/

HavocOS https://havoc-os.com/

ResurrectionRemix https://resurrectionremix.com/

DerpFest https://derpfest.org/

PixelExperience https://wiki.pixelexperience.org/

GrapheneOS https://grapheneos.org/