Writing "the end" is great.
Sometimes, you're so happy about what you've written that you just want to get it to the next step as soon as possible. You want to share it so someone else can read it and know how amazing your writing is.
You want to get some feedback from someone who wasn't in your mind the entire time you were writing.
But take a second.
Your story is great in your mind as you've written it, but rereading it might reveal a number of flaws. You might realize that there are huge plot gaps. You might realize that you didn't write it all in the same tense. You might realize that a huge plot point doesn't actually make sense.
You might be proud of writing "the end," but take a pause and read your words again before you move your piece forward for review. Keep your readers for when you need them the most. Don't lose them in a first draft that's still a little messy.