How does a new KDP writer supposed to market a book?

Because you cannot persuade readers to buy any book in which sentences do not make sense. This shouldn't be “does.” If you don't see the problem, that is a big problem.

C) Persuade book reviewers on BookTok or Substack or someplace to recommend your book. If your book is unreadably terrible, this is probably impossible.

If your book is well presented, well written, and basically free of typos, then

Here’s why exercise is so important if you’re a cancer survivor - The Washington Post

D) that are presented with bad covers, bad descriptions, or ludicrously bad interior formatting.

E) Take a solid year to learn how to use Amazon or Facebook ads and be prepared to lose quite a bit of money as you figure it out.

Are you planning to proofread your book to avoid sentences such as

Where did the false claim that Haitian immigrants are eating pets come from?

How does a new KDP writer supposed to market a book?

Or

A) that are not actually books.

Sir Keir Starmer announces national inquiry into grooming gangs - BBC

D) Pay promotion services like Written Word Media to promote your book. Legitimate services will not accept your book for promotion if the presentation is crappy or the book is badly written.

B) that are filled to the brim with typos or errors.

C) that are unreadably terrible in any other way.

Scientists May Have Discovered a Surprising Health Benefit of Mango - EatingWell

Or

B) Build a newsletter mailing list of people who will buy your book because they trust you to write books they want to read. This is slow, but ideal.

You cannot effectively promote books

iOS 26 New iPhone Release: Apple Delivers Unprecedented Update - Forbes

A) Build a following on social media, a following of people who will buy your books. Good luck with that. There is very little evidence that social media can translate to sales.