I have no suggestions on directions or big changes. However, here are a couple of (smaller ideas) thoughts You mention that you're selling individual features

I have no suggestions on directions or big changes. However, here are a couple of (smaller ideas) thoughts You mention that you're selling individual features of Gaia GPS as standalone less-expensive apps. Have you considered selling just one Gaia GPS app (with in-app-purchases to support different feature/price configurations). This will make the app more discoverable to current users as well as new users (current users who want an upgrade can do an in-app purchase easily from within the app, new users will find it easier to discover your app because the combined sales will improve the app's ranking). This will also be convenient to users (who might need to buy two different Gaia GPS apps today) Btw you may want to consider enabling blog comments on your website. You may get more comments from more people that way.