Recently we went to the mountains - we wanted cold weather, we wanted to sit around a roaring fire drinking hot chocolate. First up we did our prep work and we had our ducks (firewood) all in a row. The hot chocolate and marshmallows were on standby. Our manuscripts and red pens were ready to go.
It reminded me of the submission process for manuscripts - and no-one explains this well to beginner writers. You can do the work, you can do your homework about what lines the publisher is interested in, you can write the best book you can write, and when you submit, it isn't what the publisher is looking for. Or what that person, at that publisher, on that day is looking for, to quote my favourite editor of all time.
It doesn't make it a bad book. It just means it isn't the book for them. It's ok to be disappointed, so long as you get back up, review that manuscript and send it out to someone else.
Of course, our disappointment over the fireplace was short lived. It wasn't that cold, I had a sensational hand-knit scarf keeping my neck warm and we still had hot chocolate. However we're hopeful the repairs will be done by the next time we visit.