Most managers worry about what their people are doing wrong.
A natural concern, but it kicks off a demotivating spiral. To build motivation, remind yourself what each employee's greatest strength is. Don't use motivation methods that don't work. Some might say doing the same thing over and over, when it obviously doesn't work, isn't too sharp. Yet we often do just that, trying the same supervisory behaviors over and over and getting more and more frustrated when they don't work.