hoodlemI use Proton Mail. I recommend that whatever service you decide on, get your own domain name so you can keep your email address if you move to a different provider.
Do you have any recommendations on how to buy a domain?
Not OP, but I used Namecheap. Porkbun is also recommended I think. Setting it up is not dead-brain simple, but Proton does a very good job on explaining it step by step I believe.