What you need to consider to keep your site optimised for search engines

Use accurate, descriptive titles for your pages. 

It's a good idea to place different topics, products, or services on different pages, one topic (or closely related set of items) per page.

Be complete: Mention everything that you have to offer. Google is smart, but can't guess what you don't tell them (or the world).

Update your content to account for your business seasons, trends, or new offerings. 

For example, if you run an ice cream store that also sells hot chocolate, be sure to feature your ice cream in the summer, and your hot chocolate (or coffee, or sandwiches) prominently in the winter, when people won't be looking for ice cream stores. If a new trend starts for kiwi ice cream and you have it in your store, feature it prominently.

This one is pretty simple. There's no point in having a site that is out of date; it's a tool that should be helping you achieve your goals.

Don't put your site content or page titles only in images, video, animations, or other non-text formats that Google doesn't understand as easily as text. If you use a graphic for your site name, include the name in the page text as well.

Have your site mentioned in useful places online. See if you can get into your local online news sites, or in any other appropriate resources.