Expand your experience with C#, Python and JavaScript. Nothing gets past those three (you could add SQL to the mix). Take on as many projects as possible, preferably with increasing technical (not business) difficulty. If you plan on starting your own company, get in bed with someone with stellar business development/marketing skills, while you focus on developing/maintaining the product/service. Under this scenario, also retain the services of a good lawyer. You'll be happy you did.
