Congrats on building this and thanks for sharing. I'm working through a similar problem. One thing I'd want to know is how you're distributing the app - you're clearly able to get users. From your description the actual user archetypes aren't all that clear (apologies if you already mentioned). For example, what's the age band of user? What work do they do? Where are they located? What exactly are they using it for? If you're able to understand some of that then you may have a better sense of their behaviors and what features may resonate. In other words, I'm an advocate of niching down.