“Off the charts”

“A game changer”

Something that significantly changes a situation.

“A dead end”

A situation with no progress or solution.

“A golden opportunity”

A very good chance to do something valuable.

“A close shave”

A situation where danger or failure was narrowly avoided.

“A fresh pair of eyes”

A new person who can look at something objectively.

“A fighting chance”

A reasonable possibility of success.

“A long way off”

Far in the future or far from being ready.

“All bets are off”

The situation has changed so much that predictions no longer apply.