Writing is not the hard part.
Most people who struggle to write know exactly what they think. The words are not the problem. The shape is.
A thought without structure is just feeling. It goes nowhere. It convinces no one, not even you. The reader follows you for a sentence and then loses the thread.
Structure is not a constraint on thinking. It is how thinking becomes visible. The spine of an argument — the ground, the tension, the answer — is not a template. It is the shape a thought takes when it is ready to be shared.
Most writing advice is about language. Use shorter sentences. Cut adverbs. Read it aloud. All useful. All downstream of the real problem.
Find the shape first. The words will follow.