you can use web apps for banking, uber
although uber and most banking apps work on grapheneos, check this community verified list https://privsec.dev/posts/android/banking-applications-compatibility-with-grapheneos/

for reviews, you can use gmaps webview https://f-droid.org/packages/us.spotco.maps/

for navigation maps, you can use openstreetmap like magic earth and organic maps

if you think osm doesn’t have enough data of your area, then you can use herewego maps, its another proprietary map, but is a bit better than google on privacy