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.
There is a different danger however — after about 8 years the annual fee went from about $15 to $60.
I've had the same .org domain for around 15 years now. Except for the coup we've seen last year where somebody tried to buy it privately (thankfully averted, I believe), I've see no price hike over time.