Nextcloud! It replaces almost everything you know from the Google Workspace with privacy in mind. Just sign up and pick any hoster. https://nextcloud.com/
As for email. You have to install the mail app from the built in App Store and you can connect as many emails as you want. It works the same way like any other email client on your phone or PC.
In the last few released they made a lot of changes to the UI to give it a much more modern look.