Send an Online Newsletter
If you have a blog or website, then you should be sending a regular newsletter. No less than once a month, so your readers don’t forget you and no more than a couple of times a week, so you don’t annoy them.
The biggest reason to have a newsletter is to collect a list of all of your possible customers - their names and email addresses. The people who subscribe to your newsletter have an obvious interest in what you have to say. Cultivate that relationship.