I have accidentally applied the location of my object in blender and my object has now zeroed out. How do i fix this?
If you know exactly what location you had your object at previously, you can go into edit mode, with your cursor on the origin, use
Selection to Cursor (Keep Offset). Then, back in object mode, change the position again to the same place it was before.
If you don't know the coordinates of its original location, you could just estimate them, or you could, in edit mode, press N, and average the locations of the individual vertices to find the original position, but that would be a lot of work.
Go to the Transform Panel then type in the location or Ctrl + Z (if you have closed it then Ctrl + Z won't work).