On-Page SEO Keyword Optimization

I want to lift organic traffic for a short list of priority search terms. The site’s structure and meta data are in place; what I need now is a focused refresh of the actual page content so Google clearly understands the relevance of each target phrase... (Budget: €8 - €30 EUR, Jobs: Content Writing, Internet Marketing, Keyword Research, Link Building, Marketing, SEO, SEO Auditing, SEO Writing)