Strategy for Cause Marketing Concept

i have an e-commerce platform that sells socially responsible hats and I'm having trouble converting sales. Ive been getting traffic through my website via reddit and facebook. However, none of this traffic is converting into sales and I'm trying to figure out how exactly to approach this problem

Background: There are four hats and each is related to a different social cause. The charitable, social aspect is something I care about, but also what I believe to be a selling point, with the sale of each hat having a specific impact via the charity. (you can see the hats here: Fulcrum #1 - Syrian Refugees – Max Fulcrum New York). The hats are selling at $35 per hat.

My main method of approach is content marketing, meaning rewriting some already established viral articles and sharing them with my following on facebook and specific forums on reddit. But like i said, this is not converting sales.

Any actionable steps or advice for cause marketing? Any channel that specifically works best for cause marketing? Are my hats too expensive? Do I need to be using other types of social media channels like instagram/pinterest/twitter?

Any advice welcomed.

Thanks