Here are a few examples. Two are novella length, with one of them on the line of being a long short story. The other two are novel length.

The Bear and the Slaughterhouse Boy

Running Toward Hope

Moon over Berlin, Sun over Santorini

David and the Lion’s Den: Chapters

I've also had success with long-form creative nonfiction. The following did well on Medium, and I've been working with a screenwriter and producer for two years to adapt it into a film. He discovered it on Medium.

Brad’s Story