I'm right there with you. Long term Google product user here (Android, Fi, Gmail, Drive, Photos, Etc) and I'm winding it all down, except gmail which will remain my spam-mailbox.
For a moment I thought this would be a good use case for federated authentication, but who would you even trust to run that securely?
They sell email for your own domain (you can also buy a domain there): https://www.infomaniak.com/en
Bonus: Based in Switzerland, no EU or US jurisdiction.