To broaden a topic that you are not finding enough information about, consider these options:
Expand the time period that you are examining.
Open up the geographic location. For example, do not limit your research to New York State, but include other states as well.
Extend your research to a larger population group. For example, not just children, but adults as well.
Compare and contrast your topic with another topic.
To narrow down a topic that is too broad or unwieldy, consider these questions:
What is the time period of your research? For example, the last two years, the 18th century, or a comparison of the 1960s and the 1990s.
What is the geographic location of your research? For example, the Western Hemisphere, the U.S., New York State, or Niagara County.
On what aspect of your topic will you focus? For example, the social, psychological, legal, medical, or economic aspects.