I spend so much time writing for assignments or writing to communicate my thoughts on works I am editing that I forget to write for the fun of it. It's so good for the health of your writing to abandon convention and write something on the other side of usual.
Now, morning pages are wonderful, but I'm not talking about those. Those are more free writing to empty the mind and make room for creativity.
No, I'm talking about deciding to write something totally out of character for you, just for the fun and challenge of it. How do you know you can't write fiction if you never try? Or how do you know you can't write a poem if you don't put your pen to it? Have you ever put a limerick together just for fun? Or have you ever tried to write Haiku for the precision of the 17 syllables?
If you're a fiction writer, choose another genre.... you get the drift here. When you find your writing getting a bit stale, try writing something totally unexpected just to see if you can do it.
When I was a kid, I wanted to be a comedian. That went by the wayside in deference to more serious pursuits. So, my assignment is to write something funny.
What's your assignment?