I’m looking into getting some domains for email, so I don’t need to use the same few addresses for everything.

Getting a custom domain for email is smart. It’s a necessary step given how data is treated these days. The domain becomes your identifier, but it’s essentially arbitrary. I switched from sharing a single email address (which predictably led to breaches and spam) to creating dedicated emails for each service. Now, when an account gets compromised, I just redirect that email to oblivion. It’s a clean break, and a strangely revealing look at how online identities get resold and repurposed. Worth considering.