That's a conversion rate of 0.75%, which is actually very typical for a site without social proof. I will also mention that your site has no sort of 'character' or dialogue, its just a display of items and with the option to buy them. You need some text, an about page, brief product descriptions letting the customer know its features and what it actually is instead of just specifications. The partner products section at the bottom gives off a dodgy vibe too.
If you do those things I think your conversion rate could improve to 1-2%. But to take advantage of your conversion rate, your real problem is a traffic problem. You aren't going to get many sales off 300 visits a month, that's nothing at all, you need to think about how you will drive traffic to this store, whether it's through paid methods (adwords, fb, etc) or if you are going to hustle and work for that traffic (promote yourself on instagram, reach out, post on forums, whatever it is). Driving traffic is how you will scale up!