Do inbound marketing.

Or, outbound/direct marketing.

Those are basically your options. :)

Since your question is so broad, it's tough to be more helpful than that. But as square one, I'd define a narrower beachhead market. Web design, development, and SEO are huge disciplines, each with many smaller disciplines beneath them, and quirks for various markets beneath that.

Currently, based on searching LinkedIn for companies that also offer that stuff independent of geography, you have 10's of millions of competitors. By refining to be more niche, you could easily lower that to 10's, which is usually a great, early move for any business. It can always grow more broad later.