Full-Spectrum SEO for Two Sites

I manage two separate websites and need an end-to-end SEO push aimed squarely at boosting overall traffic. Google is the sole search engine I care about right now, so everything we do should be calibrated for its latest algorithms and guidelines... (Budget: $30 - $250 USD, Jobs: Analytics, Content Writing, Digital Marketing, Internet Marketing, Keyword Research, Link Building, Marketing, SEO)