I have a domain and a contact email address for that domain that I have exclusively used through GMail, I guess this means I need to figure out a different path forward for that, then?
Two years ago I moved to Fastmail(they're great), and pretty much setting up an alias per site/purpose. While I'm happy to see that gmail receives less & less, I still have about 150 entries in 1password that say @gmail.com... maybe one day...
But I miss a proper calendar which migadu is strangely mostly lacking (basic caldav only). Is fastmail better in this respect? And can you do wildcard emails and send/receive as whichever name you want with fastmail? E.g. I have it set so every email which comes to xyz@domain.com arrives in my single inbox (so not catchall but all with a certain letter combo) and use this to have custom emails for every site.
Compare it to somebody who eats fast food every day. They can start eating healthy instead, but it doesn't mean that they are never allowed to eat fast food again, or even once per week if so be.
Are you looking at a real mailbox provider, or trying to keep Gmail somehow?