How do I restore a missing Apple calendar on iPhone 14 from iCloud?

My Apple calendar on my iPhone 14 disappeared. How can I restore that calendar? When I log in to my iCloud account it is still gone. It only shows a calendar from years ago. I have logged in on my laptop and on my phone and tried to restore it, but it only restores a calendar from many years ago.

[Re-Titled by Moderator]