Firefox now by default opens Facebook and Instagram in separate walled "container" tabs. Perhaps you could do the same thing with Google services? Would they be able to track by IP/user agent fingerprinting though?
I've tried making my own. The problem is even though I use ProtonMail, and Etesync (calendar) and tresorit (storage) and signal (messaging) and Duckduckgo and stay on Firefox unless i have no choice, is that i still end up with lots of stuff running in the same tab that is "non-google" simply b/c everything utilizes and embeds so many google services.
It's us versus the self-proclaimed "smartest people in the room."