Placing sometimes artificial constraints on an activity is a fascinating creativity technique. The canonical example might be that Dr. Suess’ book Green Eggs and Ham was written on a bet — a bet that an entertaining children’s story could not be written using only 50 different words. That constraint led to one of the best selling children’s books of all times.
Constraints breed creativity. Create some limits, and see what you can accomplish within them.
The very act of writing is, itself, a constraint. What can you accomplish within the limits of language?