Step up (one's) game informal verb phrase
To enhance one's performance, or the quality of one's work in order to do as well as others
My brother has got an A in Math. I need to step up my game if I want to receive a special gift from my parents.
It seems that you need to step up your game if you wanna compete with her.
Rapidly or quickly; rapid increase, progress or development
To boost one's knowlege and experience
To change someone or something into the good condition that you would like
The verb "step" should be conjugated according to its tense.
You try or experience something such as a new job, activity, etc. so that you become more familiar with it.
I worked as a teaching assistant for two months, just to get my feet wet.