Lack of intimacy with my husband

So when we were newly dating we were very intimate with each other. 3 months in he got me a promise ring at 5 months we got pregnant with our son. Once I got pregnant I lost all my sex drive, my confidence, and happiness with who I became while being pregnant. We had our son last October and I still lack the need of intimacy with my husband. We've maybe only been intimate 3-5 different times since. And its starting to put a strain on our marriage. We also have a my 3 year old daughter from another relationship. Any tips or tricks I can do to help boost my sex drive again??????