All writers get writers block from time to time. Here Neil Gamain gives some points on how to get unstuck.
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More advice from other authors can be found here:
I like his number one directive: WRITE!
It seems like a duh, doesn’t it? But, how many times have you just
sat there NOT WRITING, waiting for the perfect sentence to flow from
your brain, down your arm, to your fingertips?
Make it a January resolution: WRITE EVERY SINGLE DAY.
Check out Neil Gaiman’s “Mousecircus”