Lobbyist might be a great long term career for him . . . you are in DC, after all. Being a lobbyist is basically being in sales and marketing. So you think he'd be good in sales, which is probably true from what you right. Lots of money to be made in sales if you are really good at it.
Coaching tends to require either superstar experience or a teaching degree environment for paid positions, & the rest are staffed by volunteers.
This is not strictly true. There are tons of paid coaching positions around here in both soccer and volleyball clubs. There is A LOT of money being spent on the children of the wealthy in the area where you live. Heck, I have an uncle who makes a modest living teaching little kids
to play chess! Also, I have a family member who makes decent money on basketball refereeing as a side gig that he also uses to stay in shape. He did not graduate college and most of the other refs didn't go to college. He has friends who have taken it to a career-level and ref for the PAC-10 conference, for example. So, if he really likes soccer, he should explore coaching or refereeing for a couple of the big youth clubs in your area. It never hurts to earn cash on a side hustle you love, and you might approach the idea this way with him. The number one challenge of coaching youth sports is coping with the parents. Since he is good at listening, he might do well with this. Refereeing has a different set of skills which start with knowing the rules really well and also interpersonal skills dealing with other refs, players, and coaches. Again, might be a good fit at least for a side hustle, and some people turn it into a pretty lucrative career.
Cameraman also could work, but you might be surprised how little that normally pays. One of my friends does on ice cam for an NHL team. The pay? $75 a game. He has to be there 1.5 hours before the game starts until about an hour afterward because of post game locker interviews, and it if goes into triple overtime in the playoffs, he doesn't get overtime. He also gets to be the guy under the basket with the camera at the college bball games in the same arena, and he does some college football. Same pay rate. Mostly he does it because it gets him a good free seat at the game. But it is a lot of work; the shoulder cameras are heavy. He says the guys who travel with the networks make more money, but that involves travel that he doesn't want to do. Unfortunately cameraman is not always viewed as a high skill position. As he describes it, you have to be good at pointing it where you are supposed to point it (if you don't know, someone will remind you impolitely on your headset) and focusing it.
Good luck with it all. You seem like a great Aunt!