No one can answer this question for you. Here's a way to answer it yourself. Inventory your domain knowledge, that is list those subjects, however seemingly i

No one can answer this question for you. Here's a way to answer it yourself. Inventory your domain knowledge, that is list those subjects, however seemingly irrelevant, that you know very well. Turn them upside down, forward and backward, inside out... while looking for the faintest hint of an idea, then seize on it and push it as far as you can. Don't rely on your skill to make it with a side project. Programming skill is common. It's what you know that's different from everyone else that will make it for you.