De-Googling your computer is a topic that has come up countless times on other discussion fora. See:
How to Remove Google From Your Life (And Why That’s Nearly Impossible)
https://www.howtogeek.com/348792/how-to-remove-google-from-your-life/
[3 Effective Methods] How to Completely Uninstall Google on Mac?
https://www.macube.com/how-to/uninstall-google-on-mac.html
(DO NOT download or buy any cleaner apps this site recommends!)
How to uninstall Chrome from Mac: A step-by-step guide
https://macpaw.com/how-to/remove-chrome-from-mac
(DO NOT download or buy any cleaner apps this site recommends!)
I recommend using these free apps and services instead of Google's equivalents. Not only are they all vasty more secure, I think that they are all serious superior to Google's equivalents.:
SearX instead of Google search
https://searx.be
(I keep Searx bookmarked and pinned at the far left in my browser's Favorites bar.)
Before using SearX for the first time, go into the Preferences in the upper right of the page and set the Web sites that you want it to scrape:
Preferences --> Engines tab --> General tab
MAKE SURE THAT YOU CLICK THE SAVE BUTTON at the bottom of the General page so that you don't have to set this up each time you use Searx!
Don't set more than a maximum of three search engines to scrape, or things will get noticeably slow. I usually set it to scrape Google, Bing, and Wikipedia.
Brave instead of Chrome:
https://brave.com
(Still based on the Chromium codebase, like Chrome, but all of Google's spyware is stripped out.)
Tutanota (accessed via Apple's Mail) instead of Gmail:
http://tutanota.com
(Extremely secure encrypted e-mail. They have a generous free tier. Apple's Mail is much maligned by many, but is actually a brilliant e-mail program.)