PeeDee said:
When I stop writing, it's because there's an intelligent little voice in the back of my head which is saying "Hang on. Something stinks."
It means I'm doing the scene wrong, or I've started it too soon or too late, or I'm going down the wrong path, or the character is in the wrong place, or something like that.
It's my sub-conscious telling me that something is not jiving. Generally, I'm blocked on that project until I figure out the problem, and then I rush happily onward.
Wow, Pete and I "block" alike! Ditto for me on all that Pete said...and also ditto for the idea of working on something else. WIP #1 may not be the "one" to get you going. So work on others. I have many. MANY. The more output you have, the more chances you have to "hit".
If you've only worked on one book all this time, for sure branch out and try new things -- different genres, different lengths, different voices. If you have plenty, then pick up an older one and see how it reads now; fix it up if it needs it and if it doesn't, send it out. And on and on. It's very hard to push past the rejection, but some of us just have to persevere longer than others. (I was originally hoping to be in the fast group, but I guess I get to be in the "good example of perseverance" group instead. Happy, happy, joy, joy.)
I would still write even if no one else wanted to read anything I wrote, but I am with you in that there is a point where you want someone else to read your stuff and give you some form of validation. Maybe a critique partner, even just a sample over at the SYW forum? If you're already past that, then just keep on keeping on. Maybe that "YES!" is in the next query you send out.