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Could you please explain all that you've tried thus far?

Here they are:

  • Link Targeter- testing package
  • My own custom Facebook ads
  • I've hired and spent $600 (which to me is a lot of money) on both the ads and the marketer to use ads on Facebook Business on both my itch.io page and other pages relating to my ebook. He made other pages because he said the itch.io page wasn't doing any sales. 
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There's your problem. I'm not sure what works, but scammy SEO "experts" and Facebook definitely don't. Try word of mouth. Get a presence on more social media. Comment on blogs. Keep a blog. Post on other forums. Talk to people (that's what marketers call "engagement"). Don't just try to sell.

Also, if you have trouble selling your creations, how come they include a book that among other things claims to teach, I quote, "getting profits from your games"? You're sending mixed signals. :)

Hey! Well that company sure did the job and it seemed professional. The guy who I've hired for $600 has 4 years experience in marketing and I could tell he knew what he was doing but it didn't work. He used Facebook Business.

I feel that those advices you have given to me won't be of (much) help to me.

I honestly don't know but may be my book isn't so good. It seems I've made a mistake in "getting profits from your games". But I did give at least some good advice in the book, based on my experience. That part seems to not be in my experience, I'm sorry if I've done something bad.

Actually, I have posted on Quora about my ebook and it has sold. Maybe your ideas/advices for me aren't so bad after all!!

Well for someone who wrote a book about it, you sure do not know how marketing works. Your views are not the problem it is the book; This looks so cliche that many other "developers" wrote in the same fashion. The book has public domain images with the book cover program I seen in many other books. The file is PDF instead of an actual working file for known book devices like amazon or B&N.

Your design in book does not even look like a book but rather something you liked from a computer. No way to know how much words you have put. Very common title like you didn't put effort on the title. On the topic of effort the sections are so common in other "game development 101" books it might look like you stole it from an article. Lastly, your book vs free articles about game development startups is what makes people not want to buy it. A quick google can help people find the same article with the same title and the same section from the book.

Do you even know anything about books, you you even have rights to use unity logo on commercial book sales, etc. The marketer you spend $600 wasn't bad at his job it was your book that fail. Sorry if i'm being harsh but you really have not made any reason for people to buy your book.

Wow this is great constructive criticism.  I'm not much of a marketing expert, but the advice firecat and No Time To Play seems to be spot on.