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There are more options than GrapheneOS with broader device support, such as Calyx or LineageOS.
But if you use Android already, you can start by using F-Droid (or others) to install apps to find FOSS replacements for apps you use.
Searching for “Calyx” got me a lot of results that had nothing to do with the Android ROM, so for the convenience of anyone else reading this thread their URL is https://calyxos.org/
Thank you