Dear @andyflet,
in another topic @AnotherElk has created this nice summary of the different kind of Android systems
You should understand, that not all Android is infested by google, though strangely enough it is developed mainly by this company. E.g. the GrapheneOS project has contributed some security features to stock Android. You might want to check out the /e/ project because it has native support for your Fairphone. A match made in heaven. Other than that my suggestions would be, as mentioned above
I should add, for completeness sake the F-Droid store. Here you will find a bunch of free and open source software. Some of it is great but a lot of it is experimental, so watch out.