Go to freelancer or a similar site and take a look at what people wants to pay for. Browsing there 2-4 hours will help you know where's some demand (with cash)

Go to freelancer or a similar site and take a look at what people wants to pay for. Browsing there 2-4 hours will help you know where's some demand (with cash) and what you can do to aggregate that demand into an interesting project that works for you.