step your game up 

improve your skills or talents.

You gotta step your game up to make in in the rap biz.

step your game up by weeza September 4, 2003

Step Your Rap Game Up

Commonly used to tell rappers that their rhymes are whack, but can also be used when telling someone to improve something.

"John im afraid you got a D....Step your rap game up son!"

Step Your Rap Game Up by TMac February 14, 2005