[Android Q&A, Help & Troubleshooting] comfortable:
Root your device, preferably a 'clean' way (without questionable root software that can do more harm than good). Make a TWRP backup or similar, just in case you stuff your device.

Allow installation of apps from unknown sources in "Security > Unknown Sources". Then install AdAway (ad-blocker) from f-droid.org. https://f-droid.org/packages/org.adaway/. F-droid is officially linked from the AdAway website https://adaway.org/ since it was banned on the Google Play Store, which is testament to how much of a threat it is to Google.

The key (to me) is to kill Google's main revenue first: ads. Along with the revenue of all the other adware/tracking/spyware creators who wish to do business on the Spyware Store. The second way to kill them is to use ad-free apps as much as possible (f-droid.org can probably cater to most needs).

Installing a keyboard that doesn't spy on you is fairly important to me. You might consider AnySoftKeyboard or others from f-droid.org. After switching to the new keyboard, uninstall your default Google keyboard using your preferred root uninstaller. You can use Play Store apps like Titanium Backup to uninstall & backup if you wish. You can download Play Store apps without using Play Store by just getting their APK files on sites like https://apps.evozi.com/apk-downloader/ though some apps and games will require Google Play Store and related spyware to run. To me, those that do require Google Play Store and related spyware components aren't even worth considering.

Uninstall every single Google app on your device. Including Voice components. Plus the Play Store and related Services Framework and heaps of other Google Spyware. I have finally started to compile a list of those I have found to be safe to remove, so if you need more details, I might be able to help a bit.

There are usually better apps for Mail, Contacts, Maps, Gallery, Calculator, SMS, messaging, Calendar, Camera, etc. They are freely available without tracking/analytics, adware & spyware. An extremely good place to start inorder to get the basics are the Simple Mobile Tools apps from Tibor Kaputa https://simplemobiletools.github.io/

If you want to spend your money, consider giving it to guys like this.

Some root uninstallers I have tried have been extremely unreliable, leaving your device essentially bricked after they fail to start after removing a component, or by giving you dumb error messages after removing a safe component that other root uninstallers have no trouble with. Regrettably, I have yet to find a decent open source root uninstaller. At the moment I am using Titanium Backup to uninstall unwanted apps and components from Google, unwanted spyware from the chipset manufacturer & unwanted spyware from the device manufacturer. Personally I don't use any of the stock apps, including the stock launcher. All of these companies have a long history of customer privacy violations. All profit from profiling you and selling you out to their partners.

There are useful (adware/tracking-infested) Play Store apps like MyAndroidTools that allow you to disable certain components from certain apps which might also be useful to you. This was available on Google's Play Store but now does not appear. I use it for apps like Firefox, to disable the Crap Components I do not want running.

You might also consider XPrivacy or XPrivacyLua which gives you more control over what apps can do. You might also consider changing your DNS settings from Google's to another with apps like DNS man.

Google is the Spyware King at the moment with literally billions of devices in use, eclipsing Microsoft and Apple soyware in terms of numbers of devices in use.