[zhte415]

Google messed up my email account when they were changing something in Google for Domains (this was a free Google for Domains account, when those were free, and a personal domain, I was an earlyish adopter) and were merging Google For Domain and GMail accounts. There was no support on being locked from the account. Fortunately, having bounced around hotmail etc two decades ago, I had the foresight to register my own personal domain name, and had a backup of mails.

Have your own domain name.

Don't use your registrar to host your email, or website (interesting and wise advice from Dreamhost, a similar amount of time ago).

Running a mailserver is a pain, to be frank, unless you're in it to learn. A paid 3rd party with an SLA (Service Level Agreement) is a good option, and perhaps a privacy slant too. Perhaps Protonmail?