Ask HN: How do I get more work (sales) for a s/w services comapny?

I'm trying to help a small software services company get more clients (and more work). This company is based in India but solely focuses on the US market. They've been been making money through client projects - mostly magento, opencart, wordpress development and customization as well as making mobile apps for clients.

They never had a dedicated sales guy or BD team. In the past, they got all their clients through SEO and targeted keywords. Since a couple years, they haven't been getting much traction and revenues are down. Cold calls, cold emails and reaching out to old clients isn't providing them any sizable leads. They can't afford a full time sales rep in the US. I thought of trying elasticsales.com but they seem to be booked. Other option would be trying with salesinvaders.com and see if they get any results.

Given the scenario, what would be the best way to help them out? Are there any other cost effective ways of getting more clients?