Talk to Gynecologist on Lactation Issue

My baby is 2.5 months old and she has stopped latching. I really want her to get breastmilk directly or at least through pumping, but this has also started affecting my supply and I’m so worried it might decrease more. Has anyone gone through this? How can I increase my breastmilk supply? Which pump works best — manual, electric, or wearable? How often should I pump to keep up my supply? And is there any way to encourage my baby to latch again after refusing?