Online services and ecommerce have very high profit margins. That's because you can reach a big audience online for almost no or little money. And when you sell a service that you can do yourself the costs are very low. The time you're spending is the biggest expense. 

Think of businesses like: dropshipping, affiliate marketing, crypto bounty hunting, paid advertising, vlogging/blogging, ...

Food is a really good bussines, you just have to convert raw food into a great product, use your creativity and it will be a success