"I've gotten everything out of this I can." "There's nothing left to learn here."
"This has run it's course."
"It's not you, it's me."
Those are all ways of saying, "I have nothing to look forward to." Whether in work or in life, when you have nothing to look forward to, you need to move on. Anticipation is powerful. It breeds hope. And the absence of hope leads quickly to despair.
Whether you're looking forward to something in the next nine months or nine years, you need to have something worth waiting for, worth holding out hope for, and worth betting on.
Like waiting for your child to be born, a new baseball season to begin, or the next round of promotions, anticipating something can make the day-to-day important to you. There is no going through the motions for motions' sake. All of your work has meaning as it is build up and lead in to that which matters most.
Be honest with yourself. Ask yourself today: "Do I have something to look forward to here?"
If the answer is no, then you need to look forward to leaving.