Jane, I like the book trailer.
I'm reading a book that talks about book trailers and everything marketing by Joanna Penn, How to Market. She says if you just make the book trailer it's not likely to help. Ideally, you should have a YouTube channel, with more videos. She gives some great ideas for fiction and non-fiction writers about this. Also she says mention it on your blog (if you have one), social media etc. It's a great book...very helpful if you are looking for marketing information. She also has a blog, youtube channel, podcast...so you might be able to google her "thecreativepenn" and get some of her great advice about book trailers and other forms of marketing.
I looked at your book on amazon, and it looks interesting. Have you considered an ebook version? I almost always read fiction on my e-readers. I can easily slip an e-reader into my purse and be ready whenever I have a minute to read. I generally only buy paperbacks of books I have already read and love (and want to read again). It's just a thought.
Good luck!