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.

Or

Or

Why are Democrats at Q so desperate that they keep taking down my links to comments that prove the residents in Ohio have been filing complaints about the Haitians eating the local wildlife from ponds in the local parks? Election interference

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

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

You cannot effectively promote books

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A) that are not actually books.

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

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

What are some of the differences between the Democratic and Republican parties? What policies does each party advocate for? What groups do these parties usually represent?

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) 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.

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

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

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.

C) that are unreadably terrible in any other way.

What do you think of the Black history lessons in the PBS documentary about jazz pianist-singer Hazel Scott?

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.