You should check out "the artist way" it's a book about releasing you creativity. One of the pillars is the concept of morning pages. Just a stream of thought

You should check out "the artist way" it's a book about releasing you creativity. One of the pillars is the concept of morning pages. Just a stream of thought writing 3 pages the first thing you do after you wake up. I guess it helps training yourself to be less in "critique mode"