You could try working in small walled gardens. Like, for example, extension stores for various shopping cart software. Lurk around the forums for something li

You could try working in small walled gardens. Like, for example, extension stores for various shopping cart software. Lurk around the forums for something like opencart, shopify, etc, and you can usually find some niche that isn't covered. Like a module for a lesser known payment gateway. Or find a popular addon that's overpriced, buggy, etc, and release a competitor.