It's very common on the forums, the person who created the post doesn't give feedback on the problem or mark a solution as correct.
Currently, we need to send a message to the owner of the post, asking if the issue has been resolved and asking them to mark one of the correct answers. This gets a little difficult to manage when we actively participate in the forums.
Taking this into account, it would be interesting to have some kind of notification (Email or on the portal) asking to the post owner to give feedback on posts that he have created that do not yet have a response marked as a solution.
I believe this can help a lot to find posts where they still need help even if they have a lot of comments.