How do you flatten color in photoshop?

T.R.T. L.ove

New member
I can't figure this out. I'm making a shirt and I can only use 2 colors, black and white. I created my line art in photoshop, but now, even those lines are black and have greyish shadows around them. Anyone know how to sharpen the image or change it so the image is only black and white?
 
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