Tips for a low sex drive?

I miss the sex my husband and I used to have. He has previously said it wasn’t the same. Don’t get me wrong we still have good sex but it isn’t as often as it used to be. A bit of a tmi but when we were dating we would have sex anywhere in the house, sneak away somewhere in the house and do it. Skip class in high school to go home and do it. But now I just don’t have the drive anymore. I can’t handle some positions we used to do, or doing it every day like we used to, so I know it’s not him. Not sure if it’s because I’m not as skinny as I used to be, maybe I have low confidence or being on birth control (I stopped 2 months ago) or because we had our son. Sometimes I have these days that it’s higher than usual but it doesn’t last long. I really miss the sex with my husband, any tips to help?