For me it was advice from Dan Harmon: “Don’t try to prove you’re a good writer, you’ll never write anything. Try to prove you’re a bad writer and you’ll write everything.” Not perfect advice but it really does help me write when I’m being overly critical of my ideas.
Now this isn’t an advice, but I’m gonna share it anyway.
One of my family members knew that I wrote a lot of stories and poems and told me to stop wasting time writing them.
And when I think about it this way, I stop overthinking my stories and poems because at the end of the day, nobody is reading them except me.