I would consider GrapheneOS instead of iOS. GrapheneOS provides full compatibility with Android without Google, and you can optionally install Google Play Services. Apple is as bad as Google in some aspects.
As for your main questions, these are my suggestions:
- Email: Proton Mail or Tuta Mail
- Search Engine: DuckDuckGo or Mullvad Leta for search engines, or SearXNG for a metasearch engine
- Browser: GrapheneOS's Vanadium browser
- YouTube: LibreTube for mobile or FreeTube for desktop
- Cloud Storage: There are many options, but a familiar option for you would be Proton Drive
- Photos: Aves Gallery or Gallery, with network permissions disabled
Most of these are Android-only, because iOS is still privacy invasive by nature. More software can be found on my list of software.
Cheers!