I would regard success, to be improving your lifestyle and increasing earnings, as a result of good business practice.
Some achieve success by just woking hard and getting a higher reward as they gain experience / credibility.
Some, by widening their service options
Some by going for high volume and taking on employees
Difficult to really define success.
Some people will regard themselves as successfull by earning what they perceive to be a decent level of income that gives them all the holidays they want, have the house with which they're happy, bring up their family without worrying about their monthly outgoings.
Personally..........I've achieved much success, in several areas of life.............but the greatest success has been raising two, particularly nice girls and restoring peoples flexibility / posture, even after many years of suffering.