Whenever I'm stuck in my writing, I take a moment to step outside. I join in as life's spectator and observe the real world around me.
Typically, most of us write inside, at a table, on a chair, maybe in bed. With a pen and paper, tablet or laptop, or a typewriter. Doesn't matter. We are set indoors with our 21st century tools.
That doesn't mean we are locked in. Everywhere I've set myself up for writing, I've arranged my desk at a window.
I need to see out so that I can grow what is within.
I'm not distracted. Rather, I'm inspired. And I'm reminded of what is real. This connection to the world keeps me tethered in my fantasy. I can stretch as far out as I need while keeping an anchor on what is real and possible.
If my character is stuck (read: I'm stuck), a gaze out my window at a car passing by or a small boy walking a big dog or postman carting a heavy bag usually does the trick. Life has given me a new event to help my plot along. If this particular character is searching for something, maybe a letter arrives in the mail. Or a child asks him to help find his lost dog. Or he crashes his car into a light post and a stranger who comes to help knows something about what it is he's searching for. Anything is possible. You are the magician; you just need to reach down inside that magic bag.
When you are stuck, look outside your window. Step outside your fixed world of metal and keyboards and paper and pens. If art is to imitate life, we must participate in life. Start off as the spectator, the rest will fall into place.