Eh, it happens. I pay over $200/year for my domain + GSuite. It’s a luxury I enjoy, but a luxury nonetheless.
If I couldn’t afford that anymore, I’d probably go back to Gmail. I’d probably think to switch over many of my email addresses (for services that I use), but some may slip the cracks when the domain expires.
How much does your domain cost? Most TLDs cost under $20, and GSuite costs like $60 a year... I pay like $60 for domain + mail combined (with fastmail)
My last month’s GSuite invoice was $17.63 (CAD). It has definitely increased in price, but it’s still the cheapest unlimited cloud drive. I think the cheaper plan only includes 30GB storage.
Losing access to an account at a major mail provider seems more probable than losing control of a domain you paid for.