Need on page conversion optimization -- 2

We are a water filtration website and currently get approximately 600 visitors a day but we are only covering about 18-20 visitors a day on average. We would like to double that number on a consistent basis. In a total month, we would get about 480-500. We are needing someone who can increase our conversions. We've had someone mention that our site needs to have some major conversion optimization. We need someone who can give us advice on whether or not we need to redo certain pages of our website to increase conversion and to design it as well if that is the case. This person needs to do split testing to prove that the new design works and is mobile friendly too. We are on a 3dcart template platform. Someone please give a reasonable price and know what they are doing too.