This datapack will add a limiting barrier in the form of frostbite to your world.
When the player goes beyond this barrier, he will gradually freeze. The longer the player stays outside, the more damage he will start to receive. The barrier radius at the beginning is 2000 by 2000 blocks, but thanks to the config /function epbor:get_config you can adjust its radius yourself. Every hour of playing time, the barrier will change its position to a random number of blocks in a random direction. The time before the barrier changes, as well as the minimum and maximum number of blocks that it can overcome at a time, can also be configured in the config.
A mod is required for this datapack to work
The 1.0.0_WM datapack does not require mods to work, but instead of the frostbite effect, the player receives only frost damage once every 2 seconds.