Monetization tips for chat bot

Hi guys,

I'm author of telegram bot http://t.me/pocket_music_bot.
It finds music in open sources by artist name, song name, album name even by genre or similar tracks. It

I have around 2k weekly users and I'd like to monetize bot someway. I understand that my main competitors are music services like spotify so I can't offer premium subscription because margin is very low.

I think about integration of CPA (cost-per-action) network, but problem is that I don't have information about the audience so can't show suitable advert for every user. Moreover I also don't know where I can find marketplace for such products because most of CPA networks work with sites and web-services.

So I need some monetization advice, please share your thoughts:)