Hey Spesius if you're looking for free traffic, I would suggest reading our free ebook here. It gives extensive options for how to drive traffic to your store for free.
Otherwise, simply use social media! Make an Instagram, make a Facebook, go on Reddit, and post post post! It will definitely take more time than running paid advertisements, but it definitely works. Additionally, you'll be bringing in higher quality sessions because it won't be from an ad. Hope that helps!