Hey!
Check out forum posts on the same matter:
https://www.wix.com/corvid/forum/community-discussion/dynamic-item-page-individual-comments
You could use a repeater that is connected to your comments database and filter the comments collection for items that are only related to that particular dynamic page.
When you are passing a comment to the database, pass the dynamic page ID also.
That way you can filter the comments repeater for items that relate only to that particular dynamic page.
This can also be helpful:
https://www.wix.com/corvid/forum/community-discussion/comments-reviews-on-dynamic-pages