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.

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.

Or

Aut explicabo sapiente quis consequuntur fuga consectetur fugit.

Or

You cannot effectively promote books

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.

Hauler Talk: Dissecting the wet-weather tire rules for Mexico City - NASCAR.com

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

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

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

What is something you saw while on an airplane that you couldn't believe?

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

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.

A) that are not actually books.

Did another parent ever tell you something about your child that you didn’t know?

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

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

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.

Trump accuses Powell of keeping interest rates "artificially high" - Axios

C) that are unreadably terrible in any other way.