Lack of sex drive

I was on the depo shot for about 5 years and I recently got off it about 6 months ago. Before I got off my (now) fiancé and I had sex as often as we were able. Now that I'm off we have sex probably once or twice a MONTH. It's not that I'm not still attracted to him, I just never have the drive. Does anyone know any ways to get my sex drive back?