Amazon has shifted from primarily keyword-based ranking (A9) to a more performance-based system (often called A10).
Amazon cares less about what you say your book is and more about how readers respond to it.
Amazon watches:
- Sales consistency
- Click-through rates
- Conversion rates
- Reviews
- Kindle Unlimited reads
- Performance during the first 30 days
A huge launch spike followed by silence is less valuable than steady sales for a month.
So before you publish, get together with and map out your 30-day blueprint-to-launch day. It will make a world of difference!