Listen to your users!!
I feel like you should listen more to your users and try to reply to the feedback. There are a lot of good ideas with no answers. At least give us some update... some planned ideas goes back more than 4 years. The majority of them seem pretty easy to implement, for example how can you not add some subfolders?
Dereck largo commented
Si tan linda que pretende ser esta app pero deja sin efecto las ideas de sus usuarios durante AÑOS. Es una lastima, esta app tenia potencial
I'm waiting for a guitar tablature background for years. That would be something of the things that are really easy to implement, but it still doesn't exist.
At a minimum, spam needs to be deleted.