Ask HN: What is the best way for a startup to market locally?

For our startup we primarily do Social Media Marketing. So far results have been lackluster, in terms of SEO our website is not the greatest because it was made with time efficieny in mind therefore we chose to forego proper SEO for a earlier reelase date. With that said, what are some of the best ways we can get the attention of the local people in our area while being cost efficient?