So far, you may have a very broad topic. The way to narrow it down and find something researchable is to see what the conversation is around your topic.
Here is my broad topic: Why are people nostalgic for old or outdated technology?
Since that is a clunky search, think about specifics - typewriters, rotary telephones, record players, cassettes.
Search in the below resources and pull together any narrower topics and keywords you might want to investigate.