You’ve done this workout before, but that doesn’t mean it has to be mundane. In fact, you should never just go through the motions. Your workout can always be modified to add that extra challenge. To add an extra element of difficulty to hanging knee raises, for example, keep your legs as straight as possible with every rep.
Also, practice proper posture, and be careful not to shrug your shoulders as you hang from the bar. Keep them down and retracted.