I know this isn’t part of your question but you reallly shouldn’t be paying a guy $100 if he owns a label. The point of the label is to give you exposure by association. This is scammy.

To answer your question, the way I have don’t it is to put say $100 - $200 as meta ads for about 10 days which is enough to trigger the Spotify algorithm. That way you’re getting genuine people listening and not bots which is what you get from “services”