Writer’s block seems to be mostly caused by intimidation, either self-imposed or resistance-wise. But what is really at the root? What stops a person from doing anything which they ostensibly want to do?
Pride seems likely, or fear of failure. Perhaps it’s self-criticism, or some other mechanism. But these aren’t the real culprit. Those are the manufactured justifications.
At bottom, it stems from a lack of real desire.
That thing which seems like desire? That part of you which says it wants to do something? It’s lying. Listen more carefully, and the body will tell you what it wants.
The soul will chart the course. It will find the way. Do not stop it!
In other words, if you’re in writer’s block, then stop writing!