With apps being constantly developed, competent app developers are in high demand. Again, if you have the experience or skills to create successful apps then this could be something you could end up working on as a full-time freelancer. Check out adverts for developers on Toptal, a higher paying jobs site for experienced freelancers wanting to make money online.
I have developed what I think is a pretty cool 11-part auto responder series that solves a critical problem people have in my niche - it includes a number of affiliate links as well (although not clickbank - yet). I currently have a squeeze page set up which I'm driving traffic to through using FB ads, but I'm finding that I'm having to pay way too much for every conversion ( > $1.50 per conversion).
Research individual companies in your desired niche: If possible, it’s always better to become an affiliate directly with a company (if they have an internal affiliate program), as no one else will be dipping into your commission rate. This is the preferred route for most of the prominent affiliate marketers, including Pat Flynn. Unfortunately, it’s also the most work, as you’ll have to do the research yourself to see who offers programs (they’re usually listed in the website footer).