Write a story that takes place in the future. It could be five minutes from now or five-hundred years from now. Make your vision of the future unique; try to avoid all the different futures you’ve seen in TV and the movies. Perhaps go a subtle route – everything’s the same except we now have fourteen twelve-hour days of the week – or go for the gusto – humanity has developed stalks for our eyes and aliens are pets. Since the vision of the future is entirely yours, run with it and have some fun. Maybe even toss a favorite character into it and see how they live in another time. Give this exercise at least fifteen minutes of your time, though world-building may make you want to keep going.
Write it up and see what happens.