when to give up on milk coming in?

SB
Hi moms - I gave birth on May 5th and my milk has yet to come in (I had a c section). I met with a lactation consultant my second week and she said baby wasn't getting enough so to start supplementing. My current feeding schedule is getting baby to latch (she often doesn't), then giving her some pumped milk (I'm only pumping 0.5 oz every 3 hours), then giving her formula, and finally pumping again. I'm also taking literally every supplement (fenugreek, blessed thistle, goats rue) plus eating oatmeal.
At what point should I give up on milk coming in fully? I've been trying so hard and nothing is changing :( the whole process is very stressful and is contributing to my depression 

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