We have all been there, about to walk into a job interview to hopefully show the interviewer that we are right for the role.
We get fresh haircuts and wear our smartest attire. To cut a long story short, what we aim to do is make the best initial impression conceivable.
With this being said, try to image your website in the same way. Each time a fresh person discovers your website homepage, your company goes through a "job interview" of sorts. Prospects are reviewing what they see in detail, concluding an opinion of you, and deciding if you're worth getting to know further, and ultimately undertake business with.