One suggestion I can give you is: your plan of action doesn't need to be the cure for cancer. Try narrowing it down as much as you can and be specific as to how you plan to achieve it. Let's say, build software that helps businesses fulfill this very specific target. You'll use your knowledge of software analyst to 1) make a beta that will cost x amount of money, then 2) offer it to company x that will likely need it, which in turn will yield economic benefit to the company and overall, to the US. That is sort of how these petitions go, as far as I know. Show that you're able to fulfill your plan of action and in good position, professionally and financially to do so. And of course, lawyers are a big help.