It is not uncommon for complacency to follow achievement. And besides, I work better when I am under pressure. So don't worry. I'll get going when I have to. Instead of keeping the pressure on after experiencing success, we can observe people just getting by.
Great work is replaced with good work.
Outstanding effort and exceeding expectations is replaced by doing what is necessary to achieve a required target. But cruising doesn't cut it. This is a competitive world. Others out there want to be the market leader, to be successful. Competition gears up to overtake the leader.