Just read an excerpt from a productivity/goal setting book that concerned Tolkien.
His publisher mentioned that people wanted more about the hobbits after Tolkien published The Hobbit.
So Tolkien started another novel.
And apparently bounced between the depths of despair and the height of confidence for the entire process (he said that: “his ‘labour of delight’ had been ‘transformed into a nightmare.’”)
He gave up multiple times.
That book? Fellowship of the Ring.
You know what kept him going? C.S. Lewis’ support.
First lesson: if you’re stressing over your book, remember that Tolkien did too.
Second lesson: Writers have to support each other. Seriously. It might be the difference between a book that becomes beloved by hundreds of thousands (maybe even millions) even existing or not.