Help with Exercises for correct form

I have been shooting my compound 70 pound bow for about 8 months, turns out with bad form(had both shoulders shrugged up so I used my shoulders to draw) it caused issues with my bow elbow and my draw shoulder. I took a 3 week break, have corrected my form and now I can’t draw my bow at all. I can feel the muscles in my back working(which I never did) but I can’t shoot at all now and so idk how to get stronger when I can’t draw it back even once. I’m active in the gym and 21 but I just haven’t ever trained the right muscles. What do you recommend in order to get back to shooting asap(in the middle of bow season right now). Thank you for any advice and tips!