WordPress SEO Overhaul Needed Now

My WordPress site looks fine but its search visibility is lagging, so I need a complete SEO tune-up, both on-page and off-page. On-page work Every article needs sharper keyword focus, fresh meta titles... (Budget: $30 - $250 USD, Jobs: Internet Marketing, Keyword Research, Link Building, Marketing, SEMrush, SEO, Social Media Marketing, WordPress)