I’m sure it seems impossible now, but you will land that first nursing job. I would suggest reaching out to some of the individuals who have interviewed you and seeing what their reasons were for passing on you. They may or may not tell you, but its definitely worth a shot. Another suggestion I have is to use your connections. If you are an internal transfer, ask a nurse or manager who you trust and knows your strengths reach out to other managers/HR and put in a good word for you. I live in a pretty big city with over 10 hospitals in a 15 mile radius, and its amazing how tight-knit the nursing community is. A good reference could be the difference maker.
Good luck and do not give up. Your struggle now will make your future successes that much better.