The content of my manuscript is too complicated to be rewritten in the format of a journal. what should I do? My manuscript is actually a new theory, consisting of four chapters, 15,000 words, so it cannot be rewritten in the form of a journal. If I delete some of the content to fit the format of a journal, readers will not understand the ins and outs of my theory. 
What should I do? Can I publish it as a monograph? Does the monograph also have a scientific credit, and can be cited? Is it possible to publish a monograph without peer review?

ADD: 
See below comments. I really appreciate all of you! I will take your advice. I will divide my manuscript into four themes, and submit the most creative ideal first avoiding arguments.

I am not worried that some people say that I maybe a "crackpot" because my manuscript has no "imagination" but LOGIC and math. I am an independent researcher, who thinks outside the box. 

I just want to make a contribute to science. But I have no idea how to make a connection for these four themes when my manuscripts under peer review process.
I am sorry. The answer to your question is: rewrite it. If you wish to communicate your ideas you need to make it easy, not hard, for the reader. No-one is going to read 15,000 words to understand the ins and outs of your theory without some kind of motivation. What motivation are you going to provide: 'Trust me: you won't understand this unless you commit to reading 15,000 words'? Why would anyone bother?

Try to imagine explaining your theory to someone you have met on a social occasion. What is the theory about? Why is there some question arising in that field that you have put so much work into? What is the question? What is the answer?

If you get that far, you might be asked 'Why do think that is the answer?'.

If you can imagine that conversation then you will have created an abstract of your work. that might give you some clues as to how you might break down your work into manageable chunks for publication.