The main problem with every big provider is that there is no one to talk to if something is wrong, and sometimes the people you do end up talking with are about as useful as a chocolate teapot.
With your own domain you then have a long-term solution, as you can migrate the domain to a different host if necessary. You can even host the domain and then redirect your email to someone recognisable, like fastmail, protonmail, or even gmail, changing the redirect if/when needed.
I've been using fastmail.com for years, and have found it to be very reliable. (As with many e-mail providers, you can use it with your own domain.)
You mentioned work e-mail. That's the least reliable e-mail of all for anything non-work-related, since (1) you lose access to it immediately if you're fired or laid off, or if the company closes, and (2) you have absolutely no expectation of privacy (your employer can read or delete your messages on a system that it owns - the messages are its property, not yours).
You could subscribe to something like SpamHero and have it check the emails for you. That's the only service I know. Does anyone know about good alternatives?