I have a suggestion. Do not just accumulate the works to produce a book. Give something new from your own experience and try to present the topics in an interesting way so that the students/readers feel the urge to read it for better understanding
In case you want to broaden your previous research by adding more examples, make the title more 'general'. On the contrary, If your monograph is planned to be based on a very specific issue of your published paper (e.g. to deepen a particular question), then re-phrase your title by adding a case study. In any case, I would suggest to re-phrase the title adjusting it to the goal of your book.