Did you know that the first website listed on a Google search gets 30 times the clicks as the website in second place? Additionally, 75% of customers never scroll past the first page of search results. This is where SEO comes in - SEO stands for search engine optimization and it's goal is to get you higher in search rankings for relevant terms to your business.
Have you looked at where you rank on terms customers might search? Do you know what terms your customers might search? Let's say you own a facility in Washington DC, you might see where you rank on "DC indoor golf" and find you are at the top. Are you done? Probably not. What else might they search. . . DC golf, DC driving range, DC entertainment, things to do in DC, etc. You get the point. Each of these could be sources of traffic and customers for your business.
You could search each possible keyword one by one or you can use tools designed to help you analyze your website and get guidance on what to change or fix. I've linked one such tool below. Now that you know about SEO, use it to improve your website and get more customers.