What you can do is download the Aurora store from fdroid, which will give you access to Google Play apps without needing the Google Play store, and then go in and disable Google Play services. That way, if something breaks that you absolutely can’t live without, you can go turn it back on again. What you will find is that most apps will no longer send you notifications because most apps use what’s called Google FCM to provide you notifications which requires Google Play services. So in most cases apps will no longer send you notifications. Some apps will give you warnings to the effect of this app may not work properly without Google Play services and give you an OK button and in most cases they will work alright. And some few apps will just absolutely refuse to work. I know for a fact that Uber and Lyft will refuse to work without Google Play services enabled. With uber at least you can visit m.uber.com.

As the person mentioned above, using open source apps as much as you can is a great step in the right direction as they don’t phone home nearly as much. If at all. Make fdroid your new best friend and maybe add the izzyondroid repo to it.

Another category of apps you may have trouble with is mobile banking. I used to have a Neo bank called Chime, and their app worked fine without Google Play services, but I wanted to not need the Aurora store anymore, and I could not transfer between accounts with the Chime website, and so I ended up switching banks entirely.