If you don't move on, you'll just be one of the many desperate needy insecure guys who don't have a clue, it guarantees rejection. But if you do, she'll see values in you and there's still a slim chance that it'll create attraction in her part. The point is you have to let go of emotional attachment to the outcome.
You can't force someone to have feelings for you. I promise you it doesn't work that way. if she has expressed not liking you then you HAVE to move on even if it's hard. There's no other option. You're essentially just wasting your time and energy.