DT NEA help on supporting/participating in a sport

Kinda desperate for help or inspiration. So right now i'm quite behind on my dt nea (i do AQA) cos I dont know what to do with the sport contextual challenge.I thought I would do a shuttlecock container tube thingy that would clip onto the post in badminton. But my teacher said it was too simple and now im considering doing tennis balls or just an entire different sport. So please can anyone give me some ideas to make it more interesting or unique and how to make it easier to get top marks in the NEA, cos its prob my worst subject.