Any AI power users can help me...I am currently rewriting a book and increasing the word count from 12,000 to 20,000 words. I am using GPT Plus, setup a Project and uploaded my full manuscript into a canvas. My system prompt is focused on expanding the content while maintaining quality and structure. I am running into two issues: 1. The canvas becomes unstable and crashes as the document grows. 2. When I edit chapter by chapter, outside of the canvas, even with a clear system prompt, the output starts to drift. The content repeats similar ideas and loses alignment with earlier sections. At this point, I am questioning whether using a canvas is the right approach for a project of this size. Has anyone found a more reliable workflow for rewriting and expanding a full manuscript while maintaining consistency and avoiding repetition?