What's an interesting topic for a research paper related to English literature?

It sounds as though your topic is wide open. It can be difficult to choose a research topic if you don't have any specific ideas in mind. But you should definitely choose something that interests or excites you, and that you'd enjoy doing research on. Perhaps there is an English writer whose work you admire, and you'd like to find out if their backgrounds or other aspects of their lives influenced their writing? This would...

It sounds as though your topic is wide open. It can be difficult to choose a research topic if you don't have any specific ideas in mind. But you should definitely choose something that interests or excites you, and that you'd enjoy doing research on. Perhaps there is an English writer whose work you admire, and you'd like to find out if their backgrounds or other aspects of their lives influenced their writing? This would be a sort of biographical topic. Maybe the author you choose often writes about landscape in an interesting way (such as Thomas Hardy). Maybe there is a particular book, story or poem you enjoy, and you want to find out more about what inspired it, or what the response to it has been. 

One of the best ways to begin a writing project like this is to start with some "free writing" which basically means just starting to write without planning what you're going to say. See where your thoughts take you; you may even start out by writing something like "I have no idea what to write about!" Chances are you have some ideas floating around that will emerge as you put pen to paper. It's also a good idea to do a fair bit of writing before you begin doing research, in order to find out what you want to say or discover about your topic. Then you can look over those notes and form an idea and begin your project.

Good luck!