Pretty much what everyone else has said. But I know the feeling (or at least I think so) you are experencing. The first time I went to Korea, everything was new and excitingly different to my eyes. As I spent more time there, I got used to some things that weren't so different any more, and I didn't feel they needed to be documented. And of course, Korea has changed and isn't the country I knew 20 some years ago. Korea has been changing rapidly. My wife (who was born in Korea) and I don't know that we would even enjoy going back there.
Still, that isn't meant to say none of your photos are good. They all alre, but many don't grab me either, but then as I said, I was there a total of 7 1/2 years at different times. And I am not you. I tend to like the older Korea. But if I went back, I know I would be photographing what I saw as differences. Perhaps that is what you were doing too.
Anyway, welcome to the forums. I hope to see more of your images. Especially with the Mamiya 7. How did that travel? I have the Mamiya Super Press 23. I love the 6x7 negative, but it is a heavy beast, even with the 100mm lens. Go and carry and put a 150mm, 50mm or 250mm lens, and you need 2 men and a boy as assistants. 😀 😀