Turn off the editor and write the story to the end
You need to turn off the internal and external editor in order to finish your story. This seems like an easy task when you're writing a short story. But how difficult it is to silence this editor when you're writing a long story! Especially when, along with internal self-doubt, there are external factors. Today's story is about “Spider-Man” and its creator Stan Lee.

“This is the worst idea possible,” said the comic book publisher when Stan first showed him his hero.
“First of all, people hate spiders, so you can't call your hero Spider-Man.”
“Secondly, you want your hero to be a teenager? Teenagers can only be sidekicks to the main characters!”
“And thirdly, you want him to have personal problems?” the publisher continued to berate the young author. “Stan, do you not know who a superhero is? He can't have personal problems!”
Meanwhile, the comic book magazine was closing. There were no sales. And in the last issue, no one cared about the content anymore. That's when Stan decided to put Spider-Man on the cover. And a month later, it happened…
BOOM!!!
Sales grew! The moral: never listen to idiotic advisers; finish your story!
You start writing a story, it's easy and exciting at first. Then you stop, leaving it unfinished. Other tasks come up. And then, a day or maybe a week later, you return to your unfinished story and realize: this part is wrong... This couldn't have happened like that... This doesn't fit at all... So here it is! If you start fixing everything, there's a high risk that you won't finish your story at all.