Your first creative task as a writer is to create raw material.
I have friends who are potters. They don’t have to create their raw material (though some choose to do so). They can buy slabs of clay, they can buy chemicals to mix glazes. Their first creative task is to shape their raw material. Writers are not so lucky. We have to make something before we can shape it.
Here is your task: Make something.
Put words onto paper or onto a computer screen.
They don’t have to be words of any particular quality (good, bad, ugly). Just words. Maybe even words that form into sentences. Maybe sentences that form into paragraphs, paragraphs into pages. But not necessarily. Lists of words are fine.
Create raw material.