|A child wearing a hat and vest while looking through binoculars|
To get unstuck, I might start by looking closely at a physical object and writing down exactly what I see. Grammar, details and insight don't matter at this stage. The goal is to start writing a concrete description of something in front of me by looking closely at the object. How big is it? What color is it? If I were to smell it, what does it smell like? What about tasting it? What if I touched it? What textures are there? If I dropped it or knocked on it like a door, would it make a sound? (Yes, you're right: use your five senses to describe the object.)
You might set a timer and write continuously for five minutes. If you aren't sure what to write, you might simply repeat, "This is a stupid exercise." That should quickly bore you and you'll eventually get down to the business of writing something more interesting.
As you flex your so-called writing muscles, ideas might pop up. The object might appear to be a metaphor for something. Or you might start a scene in which you throw the object into a pool to watch the splash. Or maybe nothing comes of it, but, hooray!, you've written for five minutes and gotten started.
The key to breaking writer's block is to write. Write about anything. Write a list of what you did today and then look back over it for patterns, interesting words or insight into what you meant to do or did accomplish today. Everything is possible fodder for a piece that you can better explore in a later draft. And if you write something that doesn't go anywhere, that's ok, too.