Log in to the Kinetic Panel
Turn off the server.
Open the file manager.
Navgaite to ServerConfig.json
Change Worldmode to 1
"worldMode": 0,Save the file.
Start the server.
Core Keeper guide
How to set Hard diffculty on your Core Keeper server
This guide will quickly show you how to set the difficulty to hard on your Core Keeper server for those looking for more of a challenge