I've been using GOS for a few months and it's been great. However, my setup isn't very privacy oriented to say the least as I had to replace my iPhone and get things to work quickly on GOS (skipped stock Android). As a summary:
Google Play Services installed
All apps installed from Google Play
Use Google maps, contacts, calendar and drive
Installed banking apps and use NFC for payments
Use WhatsApp, YouTube and YouTube Music
(Literally just realized that's a lot of Google usage)
I guess my main question is what happens if I uninstall Google Play Services? I know some things would stop working or not work properly just not sure what. Also, what would be your recommendations on how to improve general security and privacy? Alternatives or better setups are very welcome!