I am not an Android expert but following the standard best practices should be enough especially since you can’t replace your OS or do anything more than ensuring good OPSEC.
The following is what I recommend:
- Follow as little information as you can to set it up. That means, don’t sign in to your online accounts and set it up as stock as possible.
- Delete all apps you can delete on your OS with whatever it comes with. You can always find other better alternatives even for your basic utility apps that comes as standard with your Android.
- Update your software - apps and the OS.
- Set up your preferred app store - I like F-Droid and Aurora Store (which can be downloaded from F-Droid).
- Download the apps privately without any PII from those app stores. I don’t know which apps you need so let me know and I can recomend some basic apps everyone should have if you are setting up your phone that is privacy and security forward.
- Change OS settings such that they are limited with how much info it can collect and transmit to Samsung and Google. Privacy Guides has some great info on Android and this forum for the best apps to download for your needs that are privacy respecting. Turn off any settings you can that isn’t needed for it to be toggled on for the OS to work. Read up and research.
- Ask follow up questions if you have any.
I’m sure there are many other things you can do but this is what I can think of at the moment. Perhaps others can answer with more advise.