terraria how retrieve deleted world back?

Answer 1

try checking the recycle bin on the computer,

if its not there then it may be possible to use a some file recovery program that can attempt to recover things even removed from the bin but its not very likely to work unless no new data is put on the computer after deleting it, also you may struggle to get such a progam for free, usually they can check and then ask you to buy berfor getting the files back

Answer 2

A free program is recuva