Our Spotify promo recommendations vary for each song based on a combination of a few main points:
1) the song’s technical quality (composition, production, vocals, mix/master),
2) how commercial the song is, and
3) specifically how many playlists/curators in our network we think would be interested in your style and choose to add your song.
The vast majority of the time, if we are recommending a smaller promoter than your previous song, it is likely for one of these reasons:
1) The new song you're looking to have promoted may be less commercial
2) The new song you're looking to have promoted may sound more like a different sub-genre and/or mood, where we have a smaller playlist network of curators who are interested in that style.
We don’t provide analyses of compositions and productions, but we do provide feedback if we think a song is promotable, as well as which tier might best fit your desires (as far as what we are able to do and what might serve you best based on your voiced goals from our initial form and call).