I was looking over my answers and came across this unanswered question where a user described my answer as "unique and helpful".
I was wondering why the user didn't accept my answer then. It's either they're not satisfied or not aware that such a feature exists. In order to "push" the user into the right direction would it be acceptable to ask the user to accept the answer? This of course also applies to answers that are not mine. E.g. to suggest to take this answer instead of another one, if there's a better answer added after the approval.