If you want to build a business, then you need a real plan for sales and marketing. Doing these well is just as hard as writing code. It takes a lot of careful thought, and it often takes money.
Even if you got your one-time appearance in TC, you'd find it wasn't enough. You need a sustainable strategy for acquiring customers. You need to calculate that the money you get from each customer is ultimately more than it costs to acquire them. Depending on your market, you may need a lot of money up-front to build a sustainable business.
These things don't take care of themselves. There's no simple one-time solution like showing up on TechCrunch. If you want a business, you have to build it.