This quote from Guy Gavriel Kay (from a 2014 article in The Guardian) has been comforting and inspiring to me in my own creative work:

I learned a lot about false starts in writing. I mean that in a really serious way. His [Tolkien’s] false starts. You learn that the great works have disastrous botched chapters, that the great writers recognise that they didn’t work. So I was looking at drafts of The Lord of the Rings and rough starts for The Silmarillion and came to realise they don’t spring full-blown, utterly, completely formed in brilliance. They get there with writing and rewriting and drudgery and mistakes, and eventually if you put in the hours and the patience, something good might happen. That was a very, very early lesson for me, looking at the Tolkien materials. That it’s not instantly magnificent. That it’s laboriously so, but it gets there. That was a huge, huge, still important lesson.