I hava an idea for you. You can build a hotel that is in big hole in the ground symilar to The InterContinental Shanghai Wonderland hotel in China. In my flat world I have is 32 blocks of terrain.
I tried to post a picture for reference but it dosn't work. It dosn't have to be as large as this one.
I am building such project for over 4 years. Is is way too big to upload it here. The save is over 160MB large. All of my uploaded builds comm from that city. i will try to upload it on MediaFire and give a link here. The project is currently on conversion to 1.18 world. It will take some time