It is best to 'drink from your own well', run your own business. To do that, you must do, or produce, something that people could benefit form or would want to buy.
If you really know what you would love to do (and it's not laying on a beach somewhere) then in your off time, concentrate on that. Sit at a desk or table, write things down. It may take 50 or 100 hours, but if you stick to it, it will come to you.