Jumping the shark nowadays meaning doing something so outside of what a character/TV series what do that the storyline moves in a bizarre direction.
However writing to the Query Shark is a good thing. She’s an agent who receives query letters and critiques the letter. Here’s a perfect one in her opinion.
Published by Norm Benson
My name is Norm Benson and I'm currently researching and writing a biography of Walter C. Lowdermilk.
In addition to being a writer, I'm an avid homebrewer.
I'm also a registered professional forester in California with thirty-five years of experience. My background includes forest management, fire fighting, law enforcement, teaching, and public information.
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Nullius in Verba 
Norm, I didn’t think it was perfect and I left a comment to say why.
Perfect wasn’t the right word for me to use. There is no perfect story or query. There is good enough. And good enough is good enough to be accepted.