Work and school emails are fine, but they might not last forever (and often neither does using an ISP e-mail address if you ever want to switch ISPs). You need something you can always come back to.
First, make sure your new email address is one you’ll actually use for a long time. That might involve finally getting your own domain and associating your email address with your real name. Something like [email protected] has a lot more staying power than [email protected]. This way, you won’t deal with an email provider, and you don’t have to worry about changing your email address ever again.
And that line is for me the real gold. I had a good 1,000+ logins and places using my previous mail address, and I’m still working through updating my mail address everywhere. It is just not something you ever want to have to do again in your lifetime. Using your own domain name means keeping your e-mail address no matter where your e-mail service is.
The other very good tip in this linked article is an added bonus of using a password manager, as you can see exactly where your old e-mail address is still in use.
See https://lifehacker.com/how-to-change-your-email-address-without-screwing-every-1481486947