You need to start by asking the question "whose problem is this solving ?" - presumably the answer is "people who are failing to get interview because of poor CV presentation" so you need to figure out who those people are, what they do and how you can reach them.

Are they students ? - in which case student forums, partnerships with careers services, etc. may be the way to go

Are recruiters seeing a lot of candidates who fit this category ? - then maybe you should partner with recruiters

And so on...