I write best when I write what I myself want to read. As soon as I start considering what the fandom might want or what will get me the most comments I feel like it becomes less interesting.

Yes, same. I think a lot of people have had the experience of coming to fandom with no preconceptions and just writing whatever, and then learning more about what's commonly written and what people expect and developing inhibitions based on that or writing what the "market" wants, and then realizing that isn't fun and going back to just writing what makes us happy.