Open idea for any interested author:
Most do-overs have a MC that either failed at life or died too young and wish for a second chance. How about a bored god/king/emporer (basically, someone who always had the power/influence to get whatever they want) who gets the opportunity to try a life of a "norm"?
ISTR that artie had a short one, where the sent-back dude went to save someone from injury/death, only to be killed by the vehicle that caused the prior accident. Not what you describe, but a definite reversal.
It might be difficult for the reader to sympathize with the one-time king, if he's now having to live an ordinary life, just like them and billions of others.
How to do that?
Or should the writer try to make him so hated that readers would continue reading, hoping something worse would happen to him?
What if say the king getting the do-over was cursed to live their life a second time as a commoner under a king similar to who he was before his curse?
The curse would include him reliving that life until a certain sequence of events occurred.