NEED ADVICE PLEASE 😔

I was on depo for over a year, it will be 2 years in November that I have been off of it and I can't seem to get a positive opk, i have been taking folic acid as well and nothing is helping, I just feel like giving up?! Why do the doctors not tell you the effects of a depo before going on it! I would never have gone on it in the first place! Is there certain tablets or vitamins I can take to help as it doesn't seem like my body is even ovulating?? Please someone help me😔