Find your biggest "competitor". Ideally a community that hacks an existing product to do what your project does. People who are already spending their time and

Find your biggest "competitor". Ideally a community that hacks an existing product to do what your project does. People who are already spending their time and money to do what your project has done. I got over 1000 users with just some sharing to a small FB group; this was mostly from them sharing the app to their friends as well. We did some paid marketing to the same group and got 3000+ users, about 3% of whom were willing to pay. If your biggest competitor is already well funded then you might want a niche that's below their radar. For example, I didn't like Asana because it was too slow and had too many team features I didn't need - I just wanted some checklists that were fast and used keyboard shortcuts. I ended up using Sublime Text plugins do this. Later, Workflowy fit the bill perfectly.