Search, browse, and recommendation are three separate paths to your book. Most authors optimise for only one.
Readers reach a book page in three broad ways: they search, they browse a category or list, or they are recommended the book by the store itself.
Search rewards relevance between the terms readers type and the terms attached to your book. Browse rewards category fit. Recommendation rewards sustained buying and reading behaviour from readers similar to yours.
You influence the first two directly through keywords, categories, and metadata. You influence the third indirectly, by consistently attracting readers who genuinely like the book.
No one controls the algorithm, and anyone claiming otherwise is selling something. What you can control is relevance, clarity, and consistency.