When writing, it's much easier to respond to a question than a title.
For example, let's imagine you were writing an essay on social media. Would you find it easier to write 200 words in response to...
Questions force your brain into response mode - it's hard not to respond to a question someone asks you.
The better you get at phrasing your questions, the easier you'll find it to write.
You are about to speed write a block of text. Make sure you've divided up your project into blocks of 150 words. You will actually write 200 words here, but edit back down to 150.