If you're going to buy a domain for this, don't get fancy with the TLD. I made the mistake of choosing a .io domain for this purpose and with the future of the TLD uncertain, I have been moving away from it, so I'm not left in a bad spot if things go sideways.
Never go for ccTLDs for anything critical, since you're practically at the whims of the government controlling it (see: .af ccTLD that the Taliban took over)
wait what? Is .io going away?
I have a .app domain for my email, and have had it since like 2018. Now I'm wondering if that was a mistake.
Yeah even sensible looking decisions can backfire. Am in the UK. Had to scrap my .eu domain due to brexit.