It is pretty much unacceptable to have a domain bouncing emails, so I’d be out of the provider before the MX TTL even expires. For outgoing emails, reputation

It is pretty much unacceptable to have a domain bouncing emails, so I’d be out of the provider before the MX TTL even expires. For outgoing emails, reputation is a huge issue, but at the same time it’s also fairly trivial to set up a (different) 3rd-party (gmail, outlook, sendgrid, whatever) with previous reputation so you can get back communicating.