Sad to say, but it sounds like perhaps you've lost trust in this horse or that he just doesn't enjoy competing. If either of those are true, then I'd move on. You aren't giving up on him; you're acknowledging that he doesn't love the same things you do.
He was my first horse that I had as a beginner, he has taken me far. Perhaps I was lucky to get this far on my lazy beginner mount. He would make an exceptional dressage horse but thats not really what I want to concentrate on. Obviously, still flatwork, as flatwork is the basis. But I don't want to concentrate on dressage for my discipline as I want to do combined training and showjumping. He really is a beautiful horse but I'm sure some lucky beginner will love him and do very well on him.