Tips for highering conversion?

I run a service called anyfn.com, and we sell premade logos. That means higher quality at a lower price, plus, it's instant. We do have quite a big problem, though. Conversion. Currently, we gain around 500-1500 unique visitors a day, but only around 1 sale ($150). What can I do to fix this large gap? Would love to know some tips or ideas if you have any! :) Cheers and have an amazing day, Fabian