Does the Government of the United States actually work? how would you improve it or fix it?
Well, of course it "works," since it's obviously functional and the country seems to be running.
I think the main problem with the US government is that it seems to be at cross purposes, in that there are serious disputes over what our government's role in society should be. Historically, the federal government's role has changed and developed extensively from what it started out as.
I could fix the government. Things could be reorganized a bit, to eliminate redundancies, inefficiency, a convoluted bureaucracy. I would probably introduce more automation. As AI gets more and more sophisticated, it will be able handle more complex roles, in which case more bureaucratic positions could be eliminated and replaced by machine. An efficient, organized, cost-effective, computerized government.
Of course, the higher level roles (President, VP, Cabinet, Congress, Supreme Court) would still be held by humans.
This could be a win-win for both conservatives and liberals.