Keep doing what works…..don’t slack off after you have achieved a “comfortable level” of success.
Is this really good advice? Of course, the answer is “it depends”. If your desire for wealth is greater than your current status, then very possibly it is good advice.
However, if a comfortable level of wealth gives you the ability to pursue your dreams while maintaining financial stability, then there is nothing wrong with getting off the wealth creation treadmill. I believe the best advice is: once you have achieved your definition of financial freedom, please shift your attention to those other activities that bring you self actualization.