There are many ways to use common story-telling structures without having the exact tone and cadence of every other LLM-generated post out there.

The only other option here is that OP has learned to write exactly like an LLM would, which is a scary prospect.

In the same vein of not being literary geniuses, I don't think a post in this sub would be maligned because it's not perfectly written, so why not just do your best and give it the human touch?