I think it should be whatever comes to your heart.
I know when I started several years ago, I wanted to sweep you off your feet with interesting topics. So I wrote every single day of the week--Sundays included--with patterned specific themes. That became tiresome. I held blog tours as well as guest posts and threw bloghops and other innovative events. It was fun! But maybe I tried too hard? I can't compete with that now! Ha.
Now I scratch my head in wonder with what interesting topics I can come up with for you. With audience in mind, I become paralyzed and then I lose myself in the 'rules' of what should please you (I have gone to writers conferences where they share with us on how to make your blog work for you). Oh boy... On top of that, I am bloggified out after more than a year when babykins has been born.
Have you lost yourself in topics that would lure readers to your blog? Or do you just write whatever comes naturally?