The simplest solution right now is to use a pin code instead (this would just be for your phone unlock, you can still use bio for app locks). It's inconvenient at first but you'll get used to it. After that, you can look into changing the OS if you want more privacy, if you can unlock the bootloader. Lineage is a good choice, and it looks like e/os is available for some Samsung phones. There's already been a recommendation for GrapheneOS but that's only available for Google Pixels for now.
I'd recommend starting slow if you're willing to wait. Switch to a pin lock, try out FOSS alternatives with fdroid, start looking into alternatives for major accounts like Google, etc. It's a lot and easy to get overwhelmed if you go all in at once. I spent 4 years switching everything over to FOSS and privacy focused options. The best time to start was yesterday, the second best time is today.
Soon enough social apps will use your selfie cam to track your eyes. Ads will only play when your eyes are engaged and pause if you're not looking at the screen. Oh boy.
Same with TVs, the built in camera will see who's watching, and Netflix, etc, will stop streaming when it sees 5 people watching when your account is only set for 4. Either one person leaves the room or you upgrade to continue watching.