Once you add your first playlist, it has to pass a manual review in order to have its status changed to Activated. This status means that your playlist is ready to be matched with new songs.
The frequency with which you receive tracks depends on the number of tracks submitted by artists which match your playlists genres. Some genres are more popular, while some are more niche. The more campaigns our artists run with genre settings that match your playlist, the higher your chances are to receive tracks for review.
This process is completely organic and transparent, and we can't impact it manually.