It could contribute by advancing the character's journey. Each chapter in Solo Leveling is like a step in the main character's evolution. Chapter 189 might be the point where he overcomes a major obstacle or makes a significant decision that changes the course of his future adventures.
In Solo Leveling 189 of the light novel, it could contribute to the overall story in multiple ways. Firstly, it could expand on the existing power system. Maybe there are new rules or levels of power that are introduced. Secondly, it could set up future story arcs. If there are new threats or mysteries hinted at in this chapter, it will keep the readers excited for what's to come. And lastly, it could enhance the world - building. By adding more details about the world, its history, and the different factions within it, it makes the story more immersive and complex.