This question already has an answer here:
I just had a case of a user who re-posted his question because his first question was closed as a duplicate. And, logically, I closed his re-post as a duplicate of his original, asking him to edit his original and explain why it's not a duplicate, so we can reopen it.
This process has worked like that for years now, but suddenly I realized that with the new message, question repetition is even encouraged:
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
Clearly, a new user who finds their questions closed will now be happy to just post their question again and again, until it's not a duplicate anymore, instead of just fixing their original post.
We need to be more explicit about this, and show this message to the OP of the question:
If those answers do not fully address your question, please edit your question and explain why it is not a duplicate.
The original message should still be visible to other users and visitors, as they can't fix that question, of course.