Fall as a noun or a verb?

How time flies. It is September, it is fall again. When we talk about fall, we always think of a season of harvest. But for some, "fall" is a verb declining.
So was my September a noun or a verb?
Well, I'd like to say harvest. But the fact is "declining" whatever. 10 profit VS 12 lose. At least, not too bad.

My best-performing stock-LEGENDARY EDU, with an increase of 99.81%. I have been investing in it for more than 1 year. Most of the time, it performed quite well.

But sadly, Alcoa dropped over 30%. I don't know if I should sell it. I might just wait and see.

Anyway, fall has not ended. I will try my best to make it a season of fruitfulness.