Personal branding is a key to all success.
Not THE key but A key
Personal branding is what other people say about you when you are not in the room.
How does that work?
Everyone who knows you or works with you has, in their mind, a baseline of you. That baseline includes your physical appearance, your attitude, the sound and tone of you voice, your ability to communicate and handle stress. It also includes your value, from their perspective.
All humans constantly baseline everything around them. We do this as a way to be able to identify a threat. Our brains are hardwired for survival. All our senses are finely tuned to identify anything out of the ordinary. When we sense this our mind and body prepare for survival (fight or flight). This cannot be changed, it can only be acknowledged and understood.
When you acknowledge that your brain and everything in your body is designed to keep you alive, you will see that this is a constant evaluation and a constant reset of a baseline of your environment.
This means you can change your baseline to others, nothing is constant except the scanning for threats. Everyone is constantly scanning and resetting the baseline in their environment.
Change your attitude, your value, your contribution and it will change in the mind of everyone around you.
This is the reason that you have a personal brand and the way you can change it to anything you want it to be.