Did you just create your website for the sake of being able to say that you were able to create one? Or did you have a hard time designing your website since you do not have experience on it and ended up settling with whatever viewable website you were able to come up? If you answered yes to these, then it would absolutely be imperative to start redesigning your website.
This is particularly true if you created your website to be the hub of your online business. Obviously, you would want to make sure that your website would be able to properly represent your company and the business that you do. And not unless you want other people to see your company as one that is very incompetent, you certainly would not want them going to a poorly designed business website.
You might want to redesign your website because your current one is not very organized. And having a disorganized website could leave viewers confused and lost. They might end up unable to find what they need or looking for and click away to the organized website of your competitor. You certainly would not like to lose business that way.
Make sure that the style you apply on your website would be the most appropriate and effective for the kind of company and business you have. The style would put all the components of your website together, creating an overall theme which should be exceptional and powerful.
In total, changing your web design could prove to be very beneficial as the promotion for your website would gain more success, the optimization of your website would increase along with your company's success.