If that’s revenue, I think you should be able to do better. Let’s assume your average order value is 20€, then your conversion rate is below 1%. The PPC others are willing to pay for these keywords is higher than 14ct and they are making a profit from it. If we assume the actual ppc in your niche is 20ct (likely higher), you would need to pay more than 20€ to acquire one customer which is already higher than your revenue.
You are not paying for your traffic, I get that. But others do so and if they are still in business, their onsite experience must be much better than yours.
I would focus on UX, conversion and increasing the avrg order value.