There are several ways of keeping the content of your website fresh. Here are a few ideas from internet research. I have already implemented some of them for my own websites and I am going to try doing the same with the remained tips.
1. Incorporate a blog on your website
2. Include a news section on your website
3. Add images or videos to your website
A gallery page is a great way of not only adding fresh content to your website but also of demonstrating what your company can do. This type of page could be updated regularly, each time you complete a project. Similarly, videos are another good way of adding fresh content to your website. Video clips could be of anything from short tutorials to product demonstrations. And even though search engines don't actually search photos and videos, you can add a description for each one, providing the search engines with fresh content to view each time you add a new one.
4. Include client testimonials on your website
Adding client testimonials to your website is a good way of adding fresh content regularly, especially if you have a lot of customers and regularly receive good feedback. And as well as being a good way of adding more content, positive feedback looks great to prospective new customers.
5. Add more menu pages to your website
The more content you have on your website, the more likely you are to increase your search engine rankings. But how can you avoid overdoing it? The key is to adding content that is relevant to your customers and to your industry. If your company is one which involves a lot of face-to-face customer contact you might choose to add a profile page for each member of staff, providing them with the opportunity of showcasing their personality. Or if your industry is quite technical, you might choose to include a resources section, which could be updated regularly with industry developments.
If you are too busy to do all the work, just hire somebody. Some trustworthy freelancer.
Good luck!