I thought about how to return the favor. I really like your book, so I thought the best thing I can do would be to give a bit of concrete suggestions. I think you need to revise the Introduction (Foreword) becasue it is the most important part of your work when you try to sell your manuscript to a publisher. so I took liberty to write the first sentence just to give an example.
When I was a teenage girl living in a remore village in China decades ago, My Dad would often talk to me about his experencie during the political turmoils that engulfed the country when he was a hight school teacher, generally considered as a member of the group of "anti-revoultoianry intellecturals" who bore the brunt of Chair Mao's policies.