in the big leagues

In an area, echelon, or sphere of great competition, success, power, achievement, etc. A reference to major (i.e., "big") leagues of sports teams. I know you're new here, but you need to perform much better than that. You're in the big leagues now. She's been involved in local politics for years, but following her election to the US Senate, she's finally in the big leagues. With this promotion, you'll be working in the big leagues. Can you handle it?