

Exodus Privacy is a good starting point. They also have an app to check your installed apps with.
One possible next step could be to install an Android firewall like Netguard or Rethink DNS + Firewall to block unwanted connections. Both don’t require root and are well documented.
Ah yes, for a start Tracker Control is even better than a Android firewall. If you don’t have F-Droid, an alternative PlayStore installed yet, you can also get it here: https://play.google.com/store/apps/details?id=net.kollnig.missioncontrol.play