'Level the playing field' is a business idiom meaning to create equal opportunities. While it might involve hierarchy changes, the primary meaning is equal competitive conditions.

'Go the extra mile' is an idiom meaning to make additional effort or do more than expected. It does not literally mean traveling distance.

'Put all eggs in one basket' means concentrating resources in one area, which contradicts the statement about diversifying across multiple sectors.

'Let the cat out of the bag' correctly means to reveal a secret. The sentence properly conveys that she accidentally revealed the surprise party.

'Keeping the home fires burning' symbolizes maintaining connection and loyalty despite distance. This metaphorically applies to remote teams maintaining organizational culture across locations.