If something is working well for you I can guarantee you it will eventually stop working for you. The universe and our reality within it is always in a state of flux therefore we have to challenge the above and stagnant way of thinking.
One of the reasons Phil Jackson won consecutive NBA championships with Michael Jordan and Kobe Bryant in two different centuries was because he did not subscribe to the above adage thought.
Bathing in the glory of success is a fools failure.
If it ain't broken, break it — and make it better. That’s what you must do after being successful. Work hard and dream big. Then find new methods to make that dream become a reality again. Keep breaking it. Over and over again.
Never stand still: if you are not getting better you are almost certainty getting worse. Keep being creative. Keep striving to get better. Keep realising that striving for excellence, striving for success, is a never ending process; something that has no end. Something you have to keep breaking and rebuilding.