Search engines measure the quantity of information in a website to determine its relevance to a search. Naturally if a web page contains 30 words of information it is not as relevant as a web page containing 300 words of information.
So how can you increase the information in a website?
Expand the descriptions of all products by adding more information about the product. Do not assume that visitors to your website know everything about your products. Provide as much detail as possible.
Add pages on the history of the products, how they can be used, how they can be serviced, their life expectancy and how they compare to similar products.
Add pages about your business, the region you service and what future products you are considering.
Biographies of principals.
Current and previous projects for service industries.