If you have experienced growth, you feel like you're solving a real problem, and your main challenge is a marketing funnel...

You're not alone =) Awareness is a huge problem for just about every startup. Unfortunately, the only answer the Lean Startup movement has to offer is kind of, "Build it, and they will come" which doesn't work for most companies. Hence the emergence of "growth hacking."

So, before pivoting, definitely test a few marketing strategies and try and get a general understanding of your cost-per-user. It takes time to optimize that number, but I would definitely try understanding the cost and difficulty/ease of acquiring users before ditching a potentially successful idea!