Breastfeeding and weight loss plateau

I’m 7 months pp. I’m 5’8 inches tall and started out weighing 150 when I got pregnant. I gained 43 pounds. I’ve got down to about 157 but for the last couple of months can’t seem to get lower than that. I’m trying to eat high protein/low carb as much as possible and exercising, drinking lots.

I’m still mostly EBF, babe is only eating solids maybe once a day and still prefers breast most of the time.

Why can’t I lose the rest of the weight? I don’t want to cut more calories cuz I’m breastfeeding. Any suggestions?