Sorry, buttplug.io is already taken so I don’t have any more ideas.

I made mine firstname@lastname.me but I also have it set up with proton Mail as a catchall email address so I can give out literallyanything@lastname.me and it all goes to the same inbox with the ability to filter and send some addresses strait to trash.

It is like a tattoo: Do not think too much about the first or third tattoo/domain. the tenth will give you an feeling and the 15th you feel completed. Just start with one and as soon as you have control over your first digital cert endpoint, you can forward easy from it to any other domain in you control and depricating out unwanted domains over years without problems. It is a road not the destination to choosen your first domain. Hit the Road Riddick and don't you come back no more.

The first one I registred back then was uncreative yet convenient: My full legal name. I like to advise almost anyone to do so.

For all the places where you do not need or want to reveal your identity you can use something harmless website3001 (or just any random number)

For me it was just numbers .xyz and I am happy with that. Date of birth if you use it for private stuff and its $1 a month at namecheap.com.

five random letters. short enough to be easily memorizable & easily communicated by voice. no homophones, even in other languages. no one going to try to buy the domain out from under you. You could try four random letters, but that runs more risk of colliding with acronyms.

______mail.com, just come up with something available to fill the blank.

Then, use unique addresses for all services you sign up for, and they look like individual accounts created at some mail service.

You can even make a boilerplate static site at the domain to look like a genuine mail service.

surfhosted.com