Not sure how many months postpartum you’re in. I gained 17KG during pregnancy, only managed to go back to prepregnancy weight (I lost even more than prepreg) at 8months postpartum by breastfeeding. No exercise no pills no diet. Your body took 9 months to gain, it’s only normal that your body takes the same or longer to go back to how it is.
my 2nd pregnancy I gained 20kg, I managed to lose 10kg within a month thru breastfeed tho.