I personally did the de-googling yourself a while back. Personally I found the desktop side the easy part: alternative browsers and search engines. Actively trying to block Google’s tracking scripts was more involved, and sometimes “broke” webpages.
The challenge was on the phone side of the equation (especially on Android). I installed lineage OS without Google Play. It was kind of refreshing and my phone’s battery life improved immensely. However, my phone just felt like a brick with a screen. Installing apps became a chore. I was not always successful finding non-google alternatives. I was sacrificing a lot of convenience, and for what?
The “for what” or the why is the interesting aspect of this discussion. The answer here is what is going to ultimately make your endeavor successful or not.
I am not trying to discourage you. At the end of the day I was unsuccessful because I wanted to use Google’s services (maps, Gmail, YouTube…)