It doesn't matter if it is growing. If the rate of growth is not at least 100,000 users in 12 months, then your efforts are entirely irrelevant to the world.
Really? Let's say it starts with 100 users and increases users by 10x every year. In the first 3 years it will still be below your 100k users, but after 7 years it reaches a billion users (and after eight years everyone on Earth, of course). That's approximately the same trajectory as Facebook. Yet for the first 3-4 years it seems totally irrelevant and too small to matter.
This is totally hypothetical of course but it just illustrates that different trajectories can result in massive user bases.
Personally I think crypocurrencies are facing bigger hurdles to user adoption than technology or marketing, which is that most users just don't have a use for them. We are largely playing a waiting-and-exploring game until new killer apps develop or conditions in the world change and make people want something other than traditional finance. The latter context existed in 2008 when Bitcoin was released but over the years has been largely lost. Trying to sell hard into a non-receptive market (which is almost the entire world right now) is a recipe for frustration, wasted resources, and failure.
I don't mean to discourage your enthusiasm for reaching a mass market. I certainly encourage you, I just don't share your (short term) optimism that there necessarily is a mass market to be reached.