@soudk I'm assuming you are aware of all the options presented on privacytools.io
For calendar/contacts I use a self-hosted nextcloud instance which supports synching via caldav/carddav. Also most email providers offer this service. I'm at posteo and it's fine (can't have custom domains though) but I think all of the services on privacytools work. Most people seem to prefer protonmail but that's too expensive for my taste.