Privacy-protecting alternatives:

iPhone -> Google Pixel
iOS -> GrapheneOS
iCloud Photos -> Ente
iCloud Drive -> Proton Drive
iCloud Mail -> Proton Mail
Passwords and Keychain -> Bitwarden or Proton Pass
Notes -> Standard Notes (Proton)
iCloud Calendar -> Proton Calendar

Do not use Google services as some are not end-to-end encrypted.

Self-host if you can and know what you’re doing.

My favorite guide: https://www.privacyguides.org/en/tools/