ULiterally anything can make you tons of money. You start and build up to the point where you have more work than you can handle, then you hire help to duplicate your efforts keep building until you need more help and so on. There are people who make tens of millions of dollars a year and they started by cutting people's grass. It is simple, but it is not easy. There will be shit days along the way, which is why it is important to do something that you like doing. It can be fixing and selling cars that turns into a dealership or repair shop. Hell you can even clean cars and charge hundreds of dollars to do so if your quality of work reflects the fee you ask. You can also film your endeavors and stream the video and get ad revenue. There is a guy on JewTube who does just that and shows how he cleans the filthiest cars you've ever seen. There is the guy who fixes apple shit after the apple store tells them it will cost more than a new computer, he bends one connector and the crapple works again. Literally anything that excites you, there is a way to make good money off of it, but you have to figure out how to duplicate, then triplicate and so on your efforts. You are only one person and can only do so much in a day, so if lots of money is your goal, serving more people is the way to do it.