Nota Bene: I am not a marketing person!
I read your description and thought of two markets for this app.
First, highschool and college debate teams. Some great arguments are watered down because, like, you know.
Second, Toastmasters International. (They still publish a magazine!) Send them a press kit and volunteer for an interview. Provide promo codes. I remember one technique in Toastmasters required the audience to raise a hand each time the speaker said Like, You know, or ummmmm. I remember someone was tasked with keeping track of the time, and also counting ummmms. This app would fit right in. (Plus you might consider other Toastmaster functions, such as timers, 30 seconds to go, 20, 10, end of speech alerts.)
Now that I've written this, I am guessing these were probably your target audience all along, and this post is redundant.
PS: Beautiful interface! Did you get help, or do you have an awesome design background?