"What business should I start?"
Low or no-cost business models are the gifts of the modern world. You'll either learn a lot and pivot to different business ideas or you'll give up and won't have spent much money. Most people learn about 10 different business models, get overwhelmed and quit before they even get started, that's the "analysis paralysis". Just pick something and put in some effort. Look at "failures" as learning points, keep your eyes open and you might be surprised by how much is possible.