At the moment there aren’t any complete system images available, so there is no way back to vanilla FPOS. Other custom roms aren’t available either. Edit: Apparently iodéOS is available soon, that won’t help you with your Google problems though…
So your only way forward for now is staying on /e/ and trying to get the Google services you need to work into a usable state. What are the Google services you struggle with? 
Maybe others have them working already.
I do have backups of all the system partitions, but haven’t tried flashing them back yet. If that works without problems, that might be a way back to the original OS. But I won’t be able to test that for at least another week.