A thing that Zigdust09 helped me make (they did most of it (thx btw) because i've never made a datapack before)

If it doesnt start placing blocks at y=200 when you walk around do /function xwires:init

The first time you walk on a block it will place yellow concrete at y=200, if you walk on that block again it changes to orange and then red.
This means you can see where you go the most. It also shrinks the world border.