If you’re still encountering issues, some discussion of jetpack here, Cloudflare interferrence with Jetpack/WooCommerce
With a reference to
https://support.cloudflare.com/hc/en-us/articles/218377098-WordPress-Jetpack-and-Cloudflare
and
I don’t see any references to recovering after a crash in any of these discussions…suspecting that is a question for the jetpack forum. But, I’d approach it as a new instance and make sure the crash did not affect the jetpack configuration and ensure you have whitelisted the jetpack IPs in Cloudflare. Post back and let us know how it’s going and steps to recover.