Leaving Pumped Milk

Sooo I've always been the one who had A LOT of milk with both my kids that I've experienced Mastitis several times. My son now is 11 months old and I have just started working some nights part time while my husband is at home with the kids. (We work opposite shifts). Well, everything has seem to backfire on me because I no longer am producing enough milk! I know I should wing off on the breast milk but my sons pediatrician hasn't given me the ok to give him cow milk until he is one year (12 months). But I am NOT producing enough milk anymore. I'm not sure if it's my pump but I'm barely getting out 3oz. Even if I'm letting hours go by, when it's time to pump I'm not pumping enough. I'm concerned because my son loves his breast milk and what am I suppose to do if I'm not producing milk to leave him while I'm at work? Should I go "cold turkey" on him and go ahead and try the home milk? Desperately need help??! 😭😰