a shadow of (your) former self

if you are a shadow of your former self, you are less strong or less powerful than you were in the past.

He came back to work after 3 months, completely cured of the cancer but a shadow of his former self.

• on the average
• on the back burner
• on the ball
• on the bench
• on the blink
• on the block
• on the blocks
• on the boil
• on the books
• on the brink of
• on the brink of something
• on the bubble
• on the button
• on the case
• on the cheap
• on the contrary
• on the cutting edge
• on the cutting edge of
• on the cutting edge of something
• on the cutting room floor
• on the dot
• on the double
• on the edge
• on the face of it
• on the face of the earth