Your situation is one that many businesses face. Stalled growth or down revenue is usually just the symptom. Could be any of a number of things, but usually is founded trying to use yesterday's solutions to address today's problems. Company's get fat, dumb and happy, just like people. In order to grow, you need to change. Here is a link to a blog post that should give you some insights and maybe set off a couple of light bulbs - http://bit.ly/1tvMFh9. Invariably, you need objective, outside advice to help really assess the situation. Happy to start a dialogue, if that makes sense.

All the best,
Lonnie