A good plot is crucial. There should be interesting conflicts and twists that keep the readers hooked. Also, the art style needs to be visually appealing to draw people in.
You need a strong and complex villainess character. Her motives and personality should be well-defined and engaging.
The setting and world-building matter a lot. It should be unique and immersive. And don't forget the supporting characters - they can add depth and drama to the story.