Alternatively, taking the moon day as an opportunity to work on a different sequence might provide some insights that could inform your usual practice. On this note, I was introduced to Matthew Sweeney's moon day sequence some years ago and often practise a shortened version of it on moon days. In this sequence, much less emphasis is placed on the upper body in terms of the weight bearing on the hands that you find in the Ashtanga Primary Series or other common vinyasa sequences, providing a way of practising with less pressure being placed on the wrists and shoulders, and with more focus on the hips, lower back, and in opening the front of the body.