Cloud - I was using Proton until I downgraded from Unlimited. Now, no cloud for me.
Mail - Gmail > Tuta/Simplelogin > Proton/Simplelogin > Tuta/Addy
Calendar - Simple Calendar > Fossify
Notes - Keep > Quillnote > Quillpad > NotesNook
Reminders - Fossify Calendar or the phone's clock app.
Office Suite - Sheets > Cryptpad > LibreOffice
AI - Many years ago, before degoogling I used Google Assistant for a couple of weeks. Since then, nothing. I prefer to think for myself.