Do everything you can! Switch people's default search engine in their browser if they won't switch. I am nearly done coverting my entire office to DDG! Row! Row! Fight the power!
Their ads and search are their bread and butter if I'm not mistaken. So even if all you can do is change their browser's default engine every little bit helps. I myself have uninstalled chromium browsers and switch to FF/LibreWolf. I still have Google Authenticator but that will take me longer to kick with its 30+ entries. I'd love it if I could find out which services cost them money and heavily use those for the time being.
That is my next move as well as abandoning GPay. My final move will be sorting through the 400+ accounts attached to my gmail and switch that to proton. With my schedule it will take me possibly 2 months to get around to it unfortunately.