The first idea we suggest you to do is look at your design and ask yourself if it looks dated. Then take a look at some other websites in your industry to see how their website looks.
Secondly, you need to ask yourself, if your business goals, objectives and services are still the same since you last updated your website.
Thirdly, you need to be aware of options to add onto your website, which maybe expensive in the past, but maybe quite affordable now.
As you know, companies should expect to spend anywhere from 2 to 10 percent of their revenue on marketing. How much of this percentage goes to updating a website can vary widely depending on the extent of the redesign. Simply updating your site and adding a few features is relatively inexpensive.