The app is good, the audio quality is great. But I strongly recommend that you don't make the features so limited, people need to explore them thoroughly to decide whether or not it's worth subscribing to Deezer Premium. For example, I think it's quite exaggerated to have to pay to see the lyrics of the songs or choose the one you want to listen to. What I recommend is limiting the number of songs you can choose per day or per hour. I think that if the app were less "restricted", Deezer would have a lot more subscribers today. Another thing I would like to see is more well curated playlists that feature artists and songs based on certain genres or vibes.
I also think you should come back with the web version of Deezer
Anyway, these are my ideas!