Optimization is not a trick. It is the deliberate alignment of your title, subtitle, keywords, categories and description with the language real readers use when they look for a book like yours.
Categories are placement, keywords are discovery
Categories decide which shelves you appear on. Keywords decide which searches surface you. They are researched differently and both deserve attention.
Write the description for a browsing human
The first two lines are visible before the reader expands. Lead with the promise, not with setting.
Nothing here guarantees rankings
Marketplace performance depends on competition, timing, pricing and reader behaviour. Optimization improves presentation and discoverability; it cannot promise outcomes.

