National SEO Lead-Generation Campaign

My site attracts some traffic today, but I need search-engine optimization that can turn it into steady, national-level leads and sales. I would like to focus on marketing my website using any type of campaign, whether it be through social media, e-mail, or Google... (Budget: $15 - $25 USD, Jobs: Content Marketing, Digital Marketing, Google Analytics, Internet Marketing, Keyword Research, Link Building, Marketing, SEO)