Screenshots can be very helpful in certain scenarios.
Are there any open China quests in your quest tab?
If you are needing a character to appear in your Main Camp to speak to for the China quests that you are missing......you may have to do a few more quests & game mines in Greece to get those characters to appear back in your Main Camp.
I had the same issues when I changed regions once before.....did my head in for a few days.....but eventually it sorted itself out by progressing forward in the new region....then I could finalise the outstanding quests & game mines from the previous region.
If you are having issues finding a new quest in CHINA.....try doing the following:
1️⃣ Return to your Main Camp to see if there is a character there you need to speak to.
2️⃣ Return to the City Of Digjong to see if there is a character there you need to speak to....look for the Monk of the Dragon you are currently working on.
3️⃣ Return to the Temple Of The 5 Dragons to see if there is a Dragon there you need to speak to.
4️⃣ Return to the last game mine you were working on to see if there is a character you need to speak to or if there is a task you need to complete.
5️⃣ Do you need to make something or give something to a character such as food, materials or other items?
6️⃣ Do you need to complete a Journal task?
7️⃣ Do you need to make a Jadeite Key?
If you are still having issues finding a new quest....you can check out this link
Have you checked out the relevant Wiki pages, quests, maps, videos, guides, walkthroughs & hidden gifts.
In certain scenarios it is much more easier to consult, study & follow the Wiki maps instead of the videos.
You can easily find the solutions to puzzles if you check out the Wiki maps.....everything is clearly & concisely highlighted....including hidden gifts.
The Wiki pages & this forum will become your best friends throughout your Diggys Adventure journey.
Mines, Maps & Videos
Jade Doors/Locks & Jadeite Locations/Keys
Fan Based Websites