Do stuff. Fail. Learn. Repeat. Build up competences.
It is very difficult to show when you achieve competences. For example: I visited a basic and an advanced seminar on simulation software for optics. Do I feel competent?...
Unique competences are poisonous
How interchangable are you? Think about it: Where can you go right now in your organisation and still help out to at least 80 % of your actual position...