It boils down to something you and your wife would both enjoy doing, and starting a business is rough to say the least. Maybe starting a business around cars would be best because you love it? Not sure where but theres a niche im sure of it. Long days and tons of hard work, but hey youve been there, and youll do well at whatever Im sure.
Selling cars is only good if you can sell new ones and get people on the financing, or its kept a side hustle, otherwise the dealer liscences and taxes kill that profit margin big.
retail liscense is what keeps you from making good money doing that, you have to sell twice as many cars to make half as much money. Its a lot harder to sell cars in the 4-5k range unless its a steal, or else you have people screaming the ashtrays have been used, this tire is low on air blah blah blah. Not the steadiest income there.
I do have a way around that one you