You might also take a closer look at editorials to see if topical research questions are discussed. You may also get some ideas through reading articles within your specific area of interest to see if there are any section of the article that discuss potential further research questions and if there are any research gaps in the area. This might make it easier to match your manuscript with the focus of the journal, as well as giving you ideas of things to write about. Perhaps you can adjust your manuscript to better fit the journal's topics, aims and scope?