I'm also pretty much using 100% EU services except FastMail. Nothing against the Aussies, but I'd rather use something local, with servers within the EU.
But I don't think there's anything as good as Fastmail this side of the pond, and I'm not prepared to compromise on this just yet. I might self-host email despite all the dangers the day FM decides to enshittify itself.
ProtonMail? Not strictly speaking EU, but atleast EEA
It also comes with a whole suite of software that you don't have to find EU alternatives for like Calendar, Drive, Password manager, etc
https://tuta.com/ and Protonmail
German e-mail service
I'm using Startmail, based in NL: https://www.startmail.com
I love fastmail, but I really wish they had servers close to me.
The high ping kills the throughput on davfs and makes their website hosting a pain to update :(
I've used https://migadu.com/ before. Not EU, but EEA (Switzerland).