Free apps from the Play Store via Aurora Store is reasonably ok.
MicroG removes identifiable features by general.
In addition, I also deactivate firebase-settings.crashlytics.com, etc. in the iodé blocker (but requires the Pro version of the blocker – that’s exactly what I have for that).
Apps that don’t need a network, I withdraw network access globally.
If it has to be a purchase app, then i look for the possibility to pay directly with the provider. If that’s not possible, then I’m not using this app. So far I’ve gotten through this.