I want to have breast milk

Merry Christmas everyone! Here I am still thinking if I should continue to breast feed my daughter and pump. She is 8 weeks old now. I’ve been mix feeding her since day 3 as the hospital staff also said I have no to less milk. I’ve been doing the breast feed, formula, pump, routine ever since. My pumped milk decreased from 50ml daily (that’s the total) to 40, then now 20ml total daily. It is really frustrating and depressing. I really want to provide some breast milk to my baby, and she is also latching and sucking but nothing, she is just crying & mad in my breast as obviously she wasn’t able to drink any milk from me. Pumping also wastes my time as it consumes 20-30mins per pump, but I can only produce 5ml max and worst none. I don’t know what to do. Should I continue doing the routine, or accept to myself to stop because breastfeeding her just wastes her time and pumping wastes mine.

EDIT: cannot reply everyone, but really thank you so much for sharing your experiences, encouragement, and advice.