Best AI for preserving author's voice

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I’m currently working on a nonfiction / self-help book for Amazon KDP and I’d love to hear what AI tools you’re using (if any) to edit and reshape your manuscript — not to write it from scratch, but to transform it structurally.

Here’s my situation:

I wrote the core material myself, based on my personal journals. So the raw content is very authentic, emotional, and narrative-driven — more like a diary.

But I don’t want to publish a memoir. I want this to become a practical guide that helps other people — structured, actionable, clear.

What I did:

I fed my journal-based chapters into NotebookLM
I asked it to help me reorganize the material into a more “guidebook” structure
It actually did a decent job at identifying themes and extracting lessons

Now I’m manually rewriting each chapter to:

keep my original voice and rhythm
avoid sounding AI-generated
transform reflection into practical insight

The challenge:

ChatGPT hasn’t been great for this specific task (it tends to flatten the voice or over-sanitize the language).

I’m now wondering whether to test Claude or Gemini — especially for:

preserving author voice
restructuring narrative into actionable guidance
keeping emotional authenticity while improving clarity

My goal is making the book genuinely useful for readers.

So my question to you:

If you're publishing a nonfiction / self-help book on KDP, which AI do you use (or would you use) for structural editing and transforming raw personal material into a reader-focused guide?

Would love to hear your workflows or experiments.

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