Your welcome. There isn't always a one size fits all answer for kids. My oldest and I joke because I call him my practice kid, sad but funny and true.

It sounds like you maybe need to get your son involved with a group activity, sport, robotics, swimming or something. My son tried sports but never excelled, tried boy scouts etc but what finally clicked for him was we got him into a robotics/programming program and he has excelled. So you have to find what works. My wife and I are very busy too and it does help that the kids have siblings, but that isn't enough to keep them happy or to prevent them from killing each other. So we get the girls into sports, art classes, drama camps/clubs and one is doing a programming camp this summer.

My wife and I generally have a busy evening and weekend schedule working on a home projects or another property or whatever. We take the kids with us and make them learn and try stuff. I always let them bring something else to do too, cause it isn't fair in my eyes for a kid to work more then play, but they need a balance of both.

In the end, there is no wrong answer except to do nothing if you recognize it is an issue. You get only one shot at molding the human being growing up in your house. You'll figure it out, the fact you are concerned and asking the question shows you want to and care to make it better. Good luck!