Kadence - Comment form is not displaying
If your comments or comment form is missing from your posts, there are a couple different places on your site where the issue may be coming from.
WordPress Discussion Settings
Go to Settings > Discussion.
Under Default Post Settings, check "Allow people to submit comments on new posts."
Under Other Comment Settings, uncheck the box that says "Automatically close comments on posts after X number of days."
Individual Post Settings
If only some of your posts are missing comments, you may have inadvertently disabled comments on one or more of your individual posts. To turn them on, identify which post(s) are missing comments and then go to Posts > All Posts in your dashboard. Click Quick Edit on a post and make sure the "Enable Comments" box is checked.