Formal:
* Downgrade: This emphasizes the decrease in rank or importance.
* Relegate: This implies a move to a lower position or level.
* Degrade: This suggests a reduction in status or value.
* Reduce: This is a general term for lowering something, including rank.
* Dismiss: This implies removal from a position, sometimes with a demotion involved.
Informal:
* Kick down: This is a slang term for being demoted.
* Get bumped down: This implies a forced move to a lower position.
* Take a step back: This suggests a voluntary move to a less demanding position.
The best synonym for "demote" will depend on the specific situation and the tone you want to convey.