@maaikees For email, I've moved to fastmail and have been pretty happy with it.
For docs, I've personally got a Synology server and use that for syncing of my documents and can generate shareable links to documents or folders. But there's a hardware buy in for that.
If you already have a computer set up as a server, or are willing to pay for hosting, nextcloud is really quite good. That can replace pretty much every other aspect of Google workplace. I had used nextcloud many years ago before I had a Synology and liked it. If I ever decide to move away from my Synology it will likely be back to nextcloud.