Then you are probably on your own to get metal the thickness you need and make it fit between the door and the hinge. It is pretty strange that something that used to match up, with enough adjustments to align the door, no longer does. I would first suspect something is worn, rusty, or bent (were the pin bushing holes elongated, or does the bottom of the door post, or the bottom of the door, itself have rust?), but sometimes time and long term use can change things.

I might suggest making a cardboard template to fit where the shim is needed, then transfer the template dimensions to the metal. Don't forget to make sure the mounting bolts are gong to be long enough.