We have many methods for promoting websites, many of which we can not divulge do to their proprietary nature. More common methods we use are submitting press releases, online directories and social profiles. Other methods are blog posting on highly relative and authoritative websites that align with your product or service.
An unseemingly but, still related way of promotion is to continue to add/edit website content and post to your Google My Business profile. These, on face value, don't seem like promotion but, they are. We also will be submitting your website directly to Google so that they will crawl your website and index it accordingly.