Rewriting a book and increasing word count to 20,000 words

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:

The canvas becomes unstable and crashes as the document grows.
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?

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