I can run PPC campaigns (AdWords, FB Ads), know Google Analytics well, can run survey compaigns (and analyse the results), conduct usability evaluations and can write good specs (and other similar skills)- is there a freelance market for people like me?
I reckon you'd have a very easy time getting freelance work, especially if you can run a profitable PPC campaign. Make a website, show some case studies and explain what you did to make the company money. You'll be turning away work.