@MUHATTI It's natural for you to get stuck when writing a book, especially if it's your first. My advice? take a break from writing, read other books (a book or two) related to your genre for inspiration, then come back to your work with a fresh mind and start writing down anything that comes to mind, forget about editing it until you are done putting your ideas down.
If you can get a fresh pair of eyes to help you with constructive criticism and brainstorm ideas, that would be good. I find this approach helpful.