I would strongly consider the licensing or acquisition. Couple reasons for this: 1. Compelling products tend to have willing buyers. If you saw a 20x increas

I would strongly consider the licensing or acquisition. Couple reasons for this: 1. Compelling products tend to have willing buyers. If you saw a 20x increase in your user base when it became free, it sounds like people really like the product, but don't see it as a must-have (it's not addressing a serious pain for them). On the flip side, it looks like it could be a great nice-to-have for an existing device/product. 2. You'll be much better-positioned for future endeavors if you're able to realize a positive exit. Past success can give you a lot of credibility. If you can get positive returns, it'll be much easier to raise money for your next venture.