EBF -> EP

Hi everyone! So my daughter was EBF, with an occasional bottle after I went back to work (I had a flexible work schedule). Around 6 months, she became less interested in breastfeeding and would only nurse for 2-3 min per side (formally was 15+ min per side). So it became easier to just pump & give her bottles. She is now 8months and I'm struggling with my supply - it's like my supply decreases throughout the day (first pumping is usually enough for one feeding, by third pumping session of the dayI'm getting barely 2oz). Any advice is welcome!