After almost a year since the initial launch and half a year of making the service free I came up with the next ideas:
Be searchable on the Internet - by launching a dedicated site for NotifyMe.Music - www.notifyme-music.com
Provide an API for subscriptions - now every developer is able to subscribe to any artist specifying a custom webhook to trigger once there is a new release.
For API launch I used RapidAPI. Hope users will find it useful and I get valuable recommendations regarding its improvements - https://rapidapi.com/notifymemusic-notifymemusic-default/api/new-artist-songs-notifications
Generate short videos with a song in notification and send them to custom destinations.