How can topic about Bitcoin be way to narrow? I don't get it. You can write about the blockchain technology in essence. You can write about its decentralized nature and why is it important for the world -snip-.
I gave you just some pointers, there is really so many things to write about out there. Just use your imagination and research.
I want a specific question as to which I will do my research on, most of your point here is related to Economics while I'm doing a Comp. Sc. related essay.
If you are looking for some good source of material and ideas I can recommend you this publication:
Bitcoin: Questions, Answers, and Analysis of Legal Issues -
https://www.fas.org/sgp/crs/misc/R43339.pdfYou can always answer some questions about Bitcoin's legal and regulatory concerns, including its potential for facilitating money laundering, its treatment under federal securities law, and its status in the
regulation of foreign exchange trading.