You are missing the point that while you are free to do as you please, others also enjoy that same freedom. I don't WANT to make posts about fashion, cooking, politics, or non-techie things, but if you do, then by all means, please do that? Be the change that you would like to see in the world, and all that? I hope you find your bliss.
While I am at it though, "nobody talks about anything else" is objectively false - it is a "feels like" statement that falls prey to the hyperbolic fallacy that your POV is the only one that matters. In point of fact though, there are TONS of such discussions happening, right now, all across the Fediverse! Granted, probably not at the frequency that you want, or perhaps not as easily discoverable as you wanted. Have you considered that Reddit or Twitter or Facebook etc. may legit serve your needs better at the moment, and that's okay too?
For fantastic artwork here though, check out magazines such as m/digitalart@lemmy.world, or here's a post sharing a youtube video with nice music. For cooking, I see THOUSANDS of members making THOUSANDS of comments across MANY different places: here's a comprehensive list of those across all of kbin.social - e.g. m/food has 2243 members and 2209 posts, and m/food@behaw.org has >1k comments (looks like concentrated mostly in a few posts such as https://kbin.social/m/food@beehaw.org/t/71429/What-do-you-eat-that-other-people-think-is-odd). Surely people might even talk about politics here, a tiny bit?:-P
And now we both are breaking your rule: discussing things about the fediverse. This place is for those with an early-adopter mindset: we don't have daddy spez over here "taking care of us", so we must build our own things. Thus, we often resort to talking about actions that involve that process - which I for one don't think is a bad thing? It makes us better, to have these civil conversations about how to make things better moving forward! Although I think your post is poorly written, using inflationary emotional language that misses several points. Even so, I am absolutely LOVING how the comment section here isn't full of harassers saying things like "U SUK", but instead people offering constructive feedback, both positive and negative. To me, THAT is the difference between this place vs. Reddit that makes me enjoy being here more than there. Even though, admittedly yes, it does have FAR less content, and it is all of a biased nature (towards the topics that we here enjoy posting about).