Breastfeeding

Any breastfeeding advice? I breastfed my second but also did formula. Around 3 months she stopped wanted breast milk. Not sure it’s because I was eating shitty or what but she just stopped latching. When she did latch she’ll make a face then stop and not want to latch anymore. So I need tips to full on breastfeed. Any tips on what best to eat, supplements, drinks, breastfeeding smacks, best pumps and wearable pumps. Just anything.