A keyword slot is not borrowed advertising space.
When a keyword idea is another author's name, an unrelated brand, or a phrase that does not describe this book, I remove it. Attention borrowed from the wrong book is not reader fit.
My pre-publish test: read the title, contributors, categories, and description first. Keep a keyword only when it adds relevant reader language that those fields do not already cover.
Save the checklist: describe this book, add information, do not duplicate the metadata already on the page.