Hello Ren,
It sounds like your Ringneck might have one of two problems, improper socialization, or extreme bluffing. Improper socialization is when the Ringneck was just handfed and was not socialized properly for human companionship. Extreme bluffing is a stage that most Ringnecks go though before they reach adulthood.
Firstly, if your Ringneck was not socialized properly, you’ll have to take a few steps back and work with your Ringneck without forcing it step on you. Let the Ringneck stay on the cage while you interact with him. Remember, if he was not socialized right, his only safety and comfort is his cage. That’s all he knows. Start by just opening the door of the cage and simply letting the Ringneck explore the top. While he is there, offer him some treats and step away. Your Ringneck will start to associate you with treats. I’ll say this again and again, the best way to a Ringnecks heart is through treats. Kinda like mine;) LoL!

Really, it does work though. You are trying to let your buddy know that you’re there to be a friend and not an enemy. So rather then make him step up, just try to be his friend.
The second problem could be that your Ringneck is going through the bluffing stage. My Ringneck, Archimedes was a monster a few months ago! I just kept ignoring his violent attacks toward me and rode it out with time. His biting stopped overnight! I was holding him and noticed the biting stopped. I was really excited. Now it’s so funny, I can’t even imagine him even biting me. I can hold him anyway i like or put him in any uncomfortable positions and he just growls but dears to bite me. I promise, he or she will stop biting. Just keep working with your Ringneck. Another example is of my other Ringneck Regan, named after the little girl from the Exorcist. Let me tell you, she was one bossy little thing. Everything was her way or a BITE!!! Her excessive biting was again the bluffing stage. Like Archimedes it stopped overnight. So hang in there and ride the stage out. It’s a shame these parrots are judged on a stage that only lasts a few months, when in reality they make loving pets for years to come.
Also Ren, I commend you for sticking it out. Many inexperienced Ringneck owners cannot deal with this problem and write them off as nothing more than ornaments to a cage. That type of thinking is very psychosocially damaging to such an intelligent parrot. Good job and keep up the work. Please keep me updated!
Hope this helps & Best wishes,
I.C.