All Life in One Life.

I am writing a book, or is it a play, where the main theme is that all life is worth living, that you may find meaning in the life you live now, that there is no "correct" way to live life, no better or worse way, and that everyone should not be pursuing the same life that society has rendered as "the best", because there isn't such a thing. What you have now, is a perfectly fine way to live, and a perfectly valuable way. 

In the beginning, the protag looks around and sees his mundane life, his small household, a wife, a nine to five job, but nothing else. He dreams of the life he has been told is "good" and feels disappointed that he isn't there. He wonders what it would be like to live another life?

Instead of being transported to a parallel universe where he is living that life (like as in Everything Everywhere All At Once), he goes back in time, to his ancestors, who have all lived the lives that he has dreamed of (kings, knights, farmers, wealthy businessman, craftsman, etc), and to make it clear which generation he is currently experiencing, we can name everyone something life "Li the third, or Li the sixteenth". This is sort of life that quote from 无问东西 where the mother says "all that you aspire has been acquired by your ancestors, whether it's fame in battle or great wealth."

[this is where each chapter could be a different life.]

In the end, the protag travels to the future, where he meets his grandchildren, someone who is either just like him but found peace in life, or maybe someone he sought to be. And realizes, not only that his current life is good. But his future life may not be as bad as I thought. And not only that, but he realizes that human civilizations are not built in one generation, that his role in history, in the course of human civilization, that he may not be the once to shine light a diamond, but it's because of people like him that his later generations can. 

And with that, he finds meaning in what he does everyday once again.

(now critics may say that this is a form of self hypnosis. I... don't think so, but rather telling yourself you must be something, is not the right things to do. It will lead (statistically) to most people overinflating their expectations, and thus disappointed in their own life. And those who can do something, will do something. And that we must accept that people from all walks of life, are equally valid in their choice of lifestyle. There is ... fine line between healthy worldview and self-hypnosis to tolerate an inferior circumstance.)