1. Identify why your conversion is low before assuming it's the colors or the design of the website. Is it:
- The wrong people are coming to your website
- The right people are coming via the right google search terms, but they are not seeing the value on your site

2. Create a user profile. Why are users coming to your site? What google search terms are they using to land here. Is your home-page speaking to them.

3. Visual design can be a factor in low conversion because users subconsciously trust websites that look "professional". You can use one of the templates out there to make this happen. This is not hard - and would be an easy win.