I have no sex drive since giving birth: Advice?

Partner and I have been together for almost four years. I have a child from a previous relationship, and we also have a child together. Since the birth of our baby. Almost two years ago. I have had 0 sex drives. I don’t want him even touching me. It isn’t that I don’t love him. It’s just like affection to me now is gross(?) Not sure how else to describe. He has never been one to push or make me feel guilty. He’s been amazing. We have done it maybe three times since the birth of our son, but I can see he wants it more. He mentioned a friend couple of his do this challenge every four months or so where you have sex every day for 30 days. It’s meant to bring you closer and all this other stuff. I would like to know if anyone on here has done something similar and how you thought it helped? TIA.