Restore website from failed upgrade

upgraded wordpress on website and now the site is completely down. how do you restore on Cloudflare? Im sorry if this has been asked I have searched and cant find a similar issue

Cloudflare doesn’t offer any sort of WordPress hosting. That’s going to be with your actual web host behind Cloudflare, Cloudflare in this case is just acting as a reverse proxy, proxying requests back to your real hosting provider. You’ll have to contact your hosting provider on restoring WordPress/rolling back to an earlier version.