This would be a place to highlight alternatives to not only google, but to any apps/websites, that have a stronger focus to open source and privacy oriented practices.
A couple of great websites to use, to help with this are:
Alternative to: As the name suggests, it gives you alternatives to common websites and applications
Privacy Tools: This is a good resource again for alternatives. It also gives guides on how to setup browser extensions to harden etc.
Ill start by listing my open source alternatives i use, to most closed sourced solutions.
Reddit: Infinity for Reddit.
Podcast Player: AntennaPod
2FA Authenticator: Aegis
Calculator, Contacts, Dialer, Clock, Calendar and Gallery: Simple Mobile Tools
Loyalty Card Wallet: Catima
Email: Protonmail android app and FairEmail for the old google/microsoft accounts . Has a lot of benefits over the native apps from them.
Fitness tracker: Opentracks
Android to PC file transfer: Syncthing
Bookmark Manager: xBrowsersync
Media Player: The one, the only… VLC
Most, if not all of these are available to download from FDroid
I have also setup a raspberry pi, with Pihole DNS sinker. So it can control what trackers and such gets out of my network into the hands of data harvesters.
This should give you a few ideas, should you so wish to retain some of your data!