One major part of SEO and increasing your credibility in the eyes of Google is through content. What does that mean? The more quality content spread throughout multiple pages on your site makes your site look and rank better. If you have expanded your current services already, think about expanding those services even more. If you are a contractor that provides multiple services such as plumbing and heating, you should create a page for each service. After creating a plumbing page, you can also create a page for specific plumbing tasks such as leaky faucets, clogged drains, and no water.
Each topic and service that can possibly be built out gives your users and search engines more information. When you think there is nothing else you can do for your website, think again. Create more pages, index more pages, and create a website that ranks better.