Methodology in Finding Best traffic source for Unique Product

Hey all ! So I know there's a myriad of verticals & traffic sources that work best for those verticals. Within a particular vertical for example Bizopp, the offers are very similar and just with different landing pages, angles and so forth. But what if you had a unique offer, that wouldn't fit any vertical because its so blue ocean ? In this case, a service-related product to help people save tens of thousands on travel, and at the same time upgrade their travels (better class flights/hotels).

In such a scenario, I'm curious (and open to ideas) as to your methodology in finding the best traffic sources for such a unique offer.
I apologize if i put my question in a complicating manner, thank you

But that's clearly an existing vertical - travel!

I'd probably go with influencer marketing, SEO and if possible launching an affiliate program.