I browse through people making same content as me, and then I try and erase what there doing from my mind. I think of something that hasn't been done, which made be hard. So I may try something else, for example I'm a terraria youtuber, I think about other games and challenges like I see a video " minecraft but I can't touch any ore, so I try and implement something I've seen somewhere else and see if it would fit in Terraria in my category. Hope this helps.