Today's challenge can certainly inspire someone to write. Perhaps write a very long story, or perhaps write a very short statement. Either way, it's inspiring.
By stating that someone can invent their future, there is an inherent propensity toward action. Your future will happen to you regardless of what you do; however, if you take the view that you can invent it ... then perhaps you can (in some way) control what happens, rather than just let happen.
I am going to take the extremely long term view of this question by providing the following (very simplistic) answer: In my future, I plan on enabling others to become the best version of themselves in certain areas of their lives. I state this as a very long term goal, because I feel I still have to become that, in order to be able to impart my own wisdom on to others.