Affiliate Marketing Secrets

I am average at everything with no particular interest. How the heck do I find a “niche” to write about.
I’ve seriously planned and SEOed the crap out of articles in well researched micro-niches, but they all failed because I was only moderately interested in the topic. I also hate the process of keeping a balance between keyword bull-crap and actual human writing. I want to write, not market. *barfs*
For example. today my interests are government conspiracies… but tomorrow it could be baking pies, and the next day it could be cats. MY interests go in long cycles. I can never be consistent.
Can I break all rules and just write? Will I have a chance of making any passive income from ads this way?