Info slide: You are a successful archaeologist who has dedicated your life to publishing your discoveries with the goal of improving society and its structures by drawing inspiration from those of past societies.
In your last expedition you dedicated yourself to study and find a lost city that promises to be an almost perfect society.
After years of research and searching you succeeded.
After years of living in this society you have gathered a lot of information that would help to improve the world effectively fulfilling what was your life goal for many years, however, you have already made a life in this city, you have family, support networks, security, etc. (things you did not have in the outside world). You are given the opportunity to leave the lost city but you will never be able to return.