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?

I have a kitten who received Revolution but who just may have other intestinal parasites not covered by Revolution, so I took her to a new vet two days ago. I’ve taken fecal samples for other cats in the past, and they’ve always just checked the poop under a microscope in the vet’s office. This is a nationally-affiliated vet hospital, but they told me they would send it out and call me yesterday with the results. Well, they didn’t call, and when I called them at the end of the day, they said they hadn’t gotten any results in. So this was the second weirdness, as I’ve never had fecals done out of office and definitely have never had results on a simple test be unavailable the next day. I did pay for it, and the vet was very gentle and helpful with this kitten. But don’t you think this is unusual?