To make you feel better, I don't think DYS can offer him much either other than getting to know some other gifted children in their events, unless you want to move to Reno to attend school at Davidson.
You can participate some of the talent search things like Hopkins CTY which starts at 2nd grade and that would qualify him for their courses and summer camps. Other talent search like the Duke TIP starts later. None of these require citizenship and green card.
Does he like music or sports? Playing instruments may be a good challenge for him. Or find something he is not a natural in and do that. As long as there is something he needs to work on, I think that is enough for a young child.
But it sounds like he is doing very well. There is really no need to do more if he is happy. There will never be a program that fits his needs exactly. You just have to make it up as you go.
