thefatspacecat Commenting on the apps in your list that I have experience using:
Pixel Camera works just fine without Google Play Services. Be sure to also install [Google] Gallery and possibly Google Photos. Note that the photo processing enhancements using AI won't be available. Deny network permission for all of these apps. Also consider setting storage scopes as applicable to limit Google potentially snooping where it has no legitimate reason to be doing so.
I have never used GPay, but it likely won't work since it requires Google functionality not available in GOS. Someone else more knowledgeable than I can explain why. Maybe get a cheap Android phone exclusively to use Google services for which you cannot find suitable deGoogled alternatives.
Gboard works just fine without Google Play Services. Be sure to deny it network permission. But also try out alternatives (e.g., FUTO keyboard, Florisboard, Anysoftware Keyboard, HeliBoard) that are FOSS and more privacy-respecting. Perhaps they'll work well enough for you. If you need speech-to-text, try FUTO Voice Input (included in FUTO Keyboard, use the standalone app for other keyboard apps), Transcribro, Whisper+, or [Google] Speech Recognition and Synthesis. If you need text-to-speech, try RHVoice, Sherpa TTS, or [Google] Speech Recognition and Synthesis. Once again, deny network permission to Google SR&S.
If you absolutely, positively must use Gmail, access it through a web browser, not the app. Still intrusive, but much less so. If you want to use the web app as if it were a standalone app, try out Native Alpha. It is a wrapper for web apps.
Speaking of wrapper apps, GMaps WV is a good alternative to directly accessing Google Maps. It is powered by the Google Maps web app.
If you need or want navigation, consider using HERE WeGo. Not perfectly privacy-respecting, but at least it doesn't phone home to Google.
Rather than using Google directly as your search engine, try Startpage and Ecosia. They use Google search and then give you the results.
Organic Maps is okay, but it uses OpenStreetMap, which neither is as accurate nor as detailed as Google Maps, in my opinion.
Telegram works. Mercurygram and Forkgram are forks to consider.
VLC works.
There are plenty of alternatives to YouTube and YouTube Music. I use Newpipe and several Newpipe forks. Logging into YouTube is not required, no ads, and a Premium subscription is not required to download.
Zoom works.
If you must use apps that require Google Play Services or that require signing into Google, consider using them in a different profile or in a Private Space. Or use them in a different phone used just for those apps.