What does a novel need most?

Who can tell me what I need the most to write a novel? I'm a university student, and I usually like to read martial arts or fantasy novels. I've written novels of more than 400,000 words before, and I've written two of them. Although I'm not a professional writer, I can still copy them after reading too many novels. But sometimes, I suddenly lose my train of thought halfway through writing, and it's the same for the second one. So, I want to ask, what does novel writing rely on? Fantasy is all about fantasy. Don't talk to me about reality!
Dear internet literature experts, please help!

Answer 1

Writing a novel required creativity, imagination, and perseverance. A good novel needed a unique story structure, a fascinating plot, a deep character description, and emotional expression. It also needed a complete worldview and setting.

At the same time, novel creation also required skills and techniques such as description, dialogue, plot arrangement, character creation, etc. The author needed to constantly learn and explore these skills to create better works.

Writing novels required time and patience. A good novel could take years or even decades to write. It required the author to continuously create and modify it until it achieved the desired effect.