Comments are closed?

What do you have under SETTINGS -> DISCUSSION?

Hi Steven, I had ticked the “Allow people to submit comments on new posts”, but they can′t when it says “closed”? Which other ones do I need to tick or untick?

Did you check ”?Automatically close comments on posts older than”?

No, should I ?

No. We’re looking at why your comments are closed. Please post a link to a POST (not a PAGE) on your site where comments are closed.

Do you have any comment-related plugins?

Advanced Database Cleaner
Akismet Anti-spam: Spam Protection
All-in-One WP Migration
Deactivate | Troubleshoot
All-in-One migration
Classic Editor +
Deactivate | Troubleshoot
Classic Widgets
Complianz | GDPR/CCPA Cookie Consent
GTranslate
Health Check & Troubleshooting
Site Kit by Google
User Registration (this may be the problem?)
Yoast SEO

https://heartsofgold.today/test-using-add-new-post/

But does this just create another page?

No, that’s a POST and has a comment area. POSTs have comments, PAGEs don’t.