Multi-Platform Ads Optimisation

I have a set of Google Ads campaigns that are running, but they need proper attention. First, the existing campaigns must be fixed to eliminate wasted spend; then they have to be fully optimised so I can see stronger click-throughs and conversions... (Budget: $250 - $750 USD, Jobs: Advertising, Analytics, Digital Marketing, Facebook Marketing, Google Ads, Internet Marketing, Link Building, SEO)