What do book promotion services actually do after you hand over your book?

[aimeemoore]

I've been seriously weighing different book promotion services lately, and the more I compare, the less certain I feel. Everyone promises reach, but nobody explains the actual process. So I'm asking here which book promotion services gave your book real visibility, and what did that behind-the-scenes effort honestly look like? Where did things quietly fall apart? What would you demand transparency on before signing anything? Genuine experiences only, please.
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