The real way to grow your playlist is to have people listen to your playlists regularly, so you get more monthly listeners.
The amount of followers means nothing, if people, especially a lot, aren't listening to them at least once per month.
What you should do is get a post going, where people post their playlists, but also pick out other people's playlists, to have as their regular playlists.
It won't necessarily be you swapping playlists, but someone that listens to yours on a regular basis will have someone else pick his or her playlist, and so on.
Another good thing for everyone that picks one or more playlists to listen is to add it to their home screens. It's a reminder and a play button.
That's a feature available on Android only, right now.
