If you’ve done the readings by Roberts (“A Brief History of English”) and Pinker (“The Tower of Babel”) then you now know something about the evolution of languages in general, and English specifically.
Of the things you learned from these readings, choose one interesting concept that you didn’t know before or that you think much about before. Explain the concept so that someone who didn’t know it (or who didn’t read about it here) would know what it is. Then describe how this concept might be useful or interesting or influential in some part of your life: your writing, teaching, understanding of culture, etc.
For example, you may not have thought much about the Norman Conquest of 1066 (which Roberts writes about), or about how languages follow certain rules (e.g., if there’s a word for leg, there’s a word for arm, explained in Pinker). Those might be good concepts to explain in more detail and then apply to your life in some way. There are many more to choose from in the readings!
I look forward to reading about what you’ve learned.