For professional success, people usually make themselves known (or brand themselves) as:
- Something unique
- Recognizable by others
- Better or more distinctive than others
- Someone who is repeating success, without failures
This way you will become a sought-after specialist for your niche.
But then again, you may get bored of doing the same thing over and over again. It can also make you stuck in your niche, and not develop yourself further.
For personal development, failure is the key for learning. You should try out things that you are unsure about, because that makes you
- Aware of what you are able to do
- Discover and learn new things
So, embrace failure.
Milton Glaser: On the Fear of Failure