After vaginal delivery how to contract uterus without breastfeeding.

Due to low supply Ihave stop breast feeding since 1 month ago after delivery. My delivery is through vaginal and have done 7 section of postpartum. My tummy has reduce but still need to reduce more fat and contract uterus. Beside using binder is there any faster way to reduce belly fat and faster contract uterus. #firsttimemom