Far too many companies build a website and then leave it untouched for years. This just makes no sense what so ever.
You should think of your website as your business shop window. Now, imagine if every day of your life you walked past a large department store on your way in to the office. Every morning you have a look at the window display. If it never changes you will pretty soon stop looking at it - and the chances are high that you will not walk in to the store that often.
By contrast, if the shop's window display changes frequently, you will notice and look at it regularly. You'll almost certainly find something relevant in the window, which might entire you inside the store and ultimately lead to you making a purchase.
Exactly the same principles apply to website development. If your site is stale, looks old and is never updated, the chances of you attracting people in are limited. So make sure that you give your site a regular overhaul. We would recommend doing this at least once every 12 months.
An easy way to add fresh content to the site is to add a blog. You can spend a couple of minutes a day adding something new or simply posting your thought of the moment. Sometime you will strike a chord with a potential customer who will enter the site and buy a product from you.
The second thing that people overlook is that the internet is massively crowded with websites - there are hundreds of millions of them out there. So while it is great to have a really pretty website, if no one can find it you have a serious problem. This is where it pays dividends to engage a good search engine optimisation agency who will be able to promote your site so that it appears in the top few search engine returns.