Being Humble means you recognize when your actions are ego-driven and based in pride, and you choose instead to look for motivations based on care and respect for others and yourself. You take a balanced approach serving both yourself and others because you view both as equally part of something larger. Humility involves your struggle with desires that are deep within you for strength and security and recognition.
Have a grounded view of your success. Yes, it has to do with you and your efforts and talents. But it also has to do with luck and timing and gifts from God and others. Many, many others have contributed to your success-–your parents, mentors, colleagues, competitors, friends, family, and everyone who is part of the web of community that you live in. In many ways, your success might just be an accident of fate. Maybe, maybe not, but being humble means you know it is never completely of your own making.