I think a simplified version of what you have would work. I made the stripes wider and removed the red between them. The gold wave design is combined with the gold stripe. The emblem is reduced to its bare essentials: just mountains. Gold on blue represents wealth from the sea, the mountains are gold to show their value to people of Shandong. I'm not sure what you want to keep/remove. The wave design would be nice to have, but I would continue it along the length of the flag (so replace my gold stripe with a gold wave pattern). The mountains would be better filled in, IMO. I'm not sure what symbols you could add to make it scream "Shandong", so I'd appreciate input.