The best way to improve your writing is simple—write.
Writers don’t write because they’re afraid of doing it poorly. However, any story can be edited and improved. A blank page cannot.
Writers sometimes call this fear of writing “writer’s block,” but I don’t think writer’s block exists.
The best way to get past this is to just write.
I encourage you to write something every day, whether that writing ever is read by anyone other than you or not.
Here is some more advice on how to write a lot.
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How do you exercise your writing muscle?