In illustrator, I hit 'expand' and deleted the white background of my vectorized image, but now that I've deleted what paths I wanted to delete, I want to get back to where I can adjust the image trace parameters of the whole image, not each tiny tile of the temple.
Expand a Live Trace, the tracing options are no longer available.
There is no way to "go back" and edit the options used in tracing other than to
Undo or start over.
If you merely want to remove the white background when live tracing, tick the
Ignore White option on the Image Trace Panel under the Advanced Options.