Hello guys, so I've been thinking of doing print on demand and I want my niche to be dramas but I'm so stuck on how to start it or what kind of design to do.

if you wanted to buy a t-shirt or something like that, what kinda would you buy? what do you guys think sells well? can you guys help with brainstorming? I just feel like if I design simple clothes that says "I am a drama fan" nobody would be willing to buy it.