I would like to have my own business. It would be a phone charger business. I would buy car adapters and charging cables, create a phone create a phone charger and sell it for a great price depending on the design and speed.
My ideas so far are a charger powered by someone walking with it strapped to a leg and the other idea is a charger the charges your device when you are cycling.
I got these ideas from a 5-minute crafts men video. If you want to watch it here it is below.