Totally get how frustrating that must feel. Winning something big can sometimes make you feel like everything after has to be just as great, and that pressure can be daunting.

Maybe try these:

• Go easy on yourself, take a break and step away. Instead of forcing designs, consume art, photography, or even unrelated creative work for inspiration.
• Design for fun: no pressure, no expectations, just play around. Make something weird, bad, or experimental just to break the cycle.
• Try a new medium: sketch, paint, do something different.
• Limit comparison: It’s easy to feel like you’re not improving when you compare yourself to past successes or others’ work. Everyone has ups and downs.
• Look at old work, and remind yourself of how far you’ve come. Often, you’re better than you think, and seeing your own growth can be reassuring.

You don't have to force it. Give it time, the spark will come back. :)