How to regain milk supply

Wynter

I’m about two months pp and my milk supply is at an all time low. When I was exclusively pumping I could pump about 30+ ounces a day. I started my daughter on formula and ignored my aching breasts because I figured she would be in daycare soon (she’s not). Now I pump and the most I’ll get is 8 ounces a day. I’ve tried drinking more water, pumping more often, having her lay with me, and drinking mothers milk tea (didn’t help at all). So how do I regain my milk and how long should it take?