Get an email address that you own, on a domain you control. Switch to a provider that takes your money for whom you are the customer - not the product.
I did this with Fastmail and Iki.fi, a Finnish non-profit[1], who have been selling people "permanent" email addresses since 1995.
I go through the filter every now and then to see which services are still using my old address and change them to use the newer one.
It's also a nice way to find out how horribly some services have f-d up the change process. One had a non-working change email button and the CS rep just deleted my old account and told me to create a new one.
One just plain doesn't let people change their email. At all.