Since the email in question is <something>@<yourdomain>.com, can't you just add a forward for that email address to some other non-Google email at whatever hosting provider you use for <yourdomain>.com? Then the email address itself would still work, it just wouldn't go to the broken Google account.
Some of it includes pricing/specific products you can't sign up for any more, either.
I'd be happy if there was a way to migrate my account as is, with everything in tact to a regular@gmail account.
Considering GSuite is pretty much hot garbage in 2022, they're almost doing you a favor. Seriously, this is good for you. It'll be like you've been transported to the future!