Make the app look a bit nicer and easier to change languages. Don't show previously read content in the published section. Recommend a text a day. Create an app and perhaps reach out to have it put on kindle if that possible. Share data with duolingo so the programs work together to inform the lessons and or recommended content. Also to work better with tinycars. You might want to consider making it a feature of Duolingo Plus service. I also have plenty more where this has come from if you are interested just email me