Want to show everyone how great you are? Don't show them everything. Only show them the very best of what you can do. Editing yourself down to this level of focus and clarity is incredibly hard. It is probably one of the hardest things to learn as a creative professional. It is also one of the most important.
Sure you might have raw talent, but that is not enough. If you don't know that yet, figure it out now. If you never learn it, you might end up whining about it for the rest of your life and wonder why no one recognizes your genius.
What does it take?
Practice, practice, practice! You want to do something well, do it a lot, and do it all the time. Then do it some more! I believe you have to live this sort of thing. It's not enough to do it at work.
I find I practice this when working on my photography. Sometimes I am judging between the most minute of differences between photos like a 1/3 difference in exposure of a particular highlight or shadow (see below for a hint of this). Sometimes the decision is between two completely different photos with different subjects and approaches. My job is to decide which one is better.

Doing this as part of something I love really helps the work I do professionally. It sharpens my ability to see differences in designs and approaches. It makes me search and question rationales for design choices. By being critical of my own work, it helps me remove subjective judgments when looking at the work others. Also, it allows me to make quick decisions and to have faith in them.
I hope in the end it also allows others to have faith in those decisions too.