Yeah, im really sorry to hear that, dude. Stuff like that is my biggest nightmare when it comes to minecraft. Unfortunately, I dont think there is a way to revert your world using commands. I recommend to turn off the command blocks enabled setting (either the cheats menu or use "/gamerule commandblocksenabled false") to prevent any further damage from happening, as well as not associating with the griefer anymore. Dont give people op unless you really surely trust them
I dont know what that voting thing is cause im new to this site lmao, but on bedrock edition, you arent able to get items with enchantments past the normally allowed amounts unless you use an external thing to edit the nbt, which I don't know much about. This includes with commands, the only item components you can add are what they can break, what they can be placed on, inventory locked, and keeping on death
No, at least in my experience ive only ever gotten the "you cannot place blocks outside the world" when it was actually outside the world. Maybe its a bug i never seen though
Heres a method that could work In a repeating, always active command block have the command /execute as @a[tag=fill] at @s positioned ~ ~ ~ run fill ~ -64 ~ ~ ~ ~ air Once that command is in, give yourself the fill tag. In chat: /tag @s add fill and as you fly around the world the ground below you will go away. when ur done, type /tag @s remove fill and break the command block (unless u wanna use it again later) hope this might help yo
It depends on what ur tryna fill as to how you should do it, but you should be able to fill down to -64 as long as it doesnt go over the max fill amount and it doesnt attempt to fill below -64 or above the height limit