I guess I'll share my setup aha. Forewarning: I invested heavily into self hosting and being in full control of as much as possible, mainly to try to be 'Internet independent'.

• Google ads, APIs, telemetry and everything else that is not necessary: AdGuard Home (selfhosted)
• Android app store: Fdroid with IzzyOnDroid repo, failing that Aurora Store, if apps still whine about not being to use Play Services then I use the Play Store
• Gmail: Mailcow Dockerized (selfhosted) with K9 Android client
• SMS (not that I use it anyway): Fossify SMS
• Instant messaging: Matrix (selfhosted) for Discord/Telegram style with Element client, or Telegram FOSS
• File Manager (I goddamn hate that Google Files forces itself onto any phone after initial setup, even when there's a manufacturer installed one already): Material Files
• GBoard (It's also really fucking invasive): HeliBoard
• YouTube: via Revanced Manager, with Odysee as a hopeful replacement. Much lower userbase though, obviously.
• Google Photos (refuses to settle for less than 100% file access): Part of a self hosted Samba share that I keep synced to via FolderSync (from Play Store - they charge €10 for the app outside of Google)
• Chrome: Brave (I downloaded a script to debloat it of crypto and AI)
• Google Search: My partner uses Ecosia for environment reasons, and I use DuckDuckGo for privacy reasons
• Chromecast: I recommend a Roku
• AndroidOS: CalyxOS if Pixel, LineageOS if not
• Play Services: Gapps pico or nano because some things are still tied to Play Services
• Maps is superior, unfortunately, but OSMAnd is a good alt
• Google DNS, used by default by a lot of things like routers: Cloudflare 1.1.1.1 and 1.0.0.1