Weight loss while breastfeeding

Does anyone have good advice for how to lose weight while breastfeeding without losing supply? I am exclusively breastfeeding my 7 week old and pumping to store up frozen breast milk for when I go back to work. All together I am producing like 35-40 oz a day and I’d like to keep that supply up. However, I weighed 125 before pregnancy and I now weigh 147. I’d like to get closer to my prepregnancy weight. Has anyone lost weight while breastfeeding and was able to keep their supply up? I tried cutting calories and my supply dipped 😩 Who has done this successfully?