You need space from your work if you want to perfect it.
I know this, because I am only the tiniest bit obsessive about my work and I can still spend hours and days fine-tuning paragraphs and pages and finding new things to fix far beyond the time when the fine-tuning is actually improving the situation.
This is a problem, and it’s not a thing you can simply “turn off”. While you’re in the thick of it — editing, in my case, or whatever your chosen discipline does to self-correct errors in the first drafts — you can’t detach.
You reach that point where you have to let the thing sit for a while. Let it mellow. Let the dust settle. And if possible, have somebody who isn’t you have a look at it in the meantime.
Coming back to my novel after letting it lie for a month? The edits are coming fast and … well, I won’t say easy (because editing is never easy). But paired with notes from a couple of faithful readers whose input I believe in, the editing process feels about 90% less painful than when last I left it back in January.
Moral of the story: let your project rest for a little while.
And get some beta readers.