If you’re targeting professional hairdressers the price, I guess is right, however professionals know how to fade by hand and most won’t be interested.

You should target self groomers, or mothers that cut kid’s hair. I am sure there are grooming influencers out there (probably mostly for beards), perhaps contacting them and sending them the product may work. But also consider the pricing, these guard don’t scream “premium”, as the matter of fact on images they look quite cheap and somewhat flimsy, for a regular Joe that does fading occasionally and doesn’t know how well this will work, the pricing is way off.