2 MCs, low Vit D- any advice?

so, I've had two early miscarriages (around 6 weeks), and my Dr did the whole 22 vial blood tests on me for genetic and clotting issues- all fine.

I did come back slightly vitamin D deficient at a level of 25. I take 800iu a day with my prenatals- and Dr. prescribed me 50,000iu 2x a week for 3 months.

I started also low dose aspirin daily.

what else could be wrong, if anything? what else can I do?

I have pcos, I'm 30 years old, and I take metformin, victoza, and progesterone (after bfp).

I don't know if I can handle another miscarriage.