Something interesting seems to be happening in society. We set aside religion, a trend that accelerated exponentially starting in the 60s, but had no real ideological or philosophical foundation with which to replace it, so it simply created a vacuum for meaning. In my opinion that vacuum was largely filled by consumerism and hedonism. But of course those alternatives aren't really alternatives, because they give some flighting moments of pleasure, but offer little to nothing in terms of long-term satisfaction.
So we're effectively recreating, from scratch, much of the philosophy developed thousands of years ago. What you're describing is, in its fundamentals, identical to Stoicism. I'd highly recommend Marcus Aurelius' "Meditations." [1] It's a collection of the writings of Aurelius, a Roman Emperor who is oft regarded as one of the greatest leaders of society. Stoicism is most fundamentally about accepting the fact that there are many things one cannot change. The only thing we can change, about many things, is how we let it affect us.
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The most interesting thing about the writings is that they were never intended to be seen by anybody other than himself. So it's effectively a collection of post-it notes from a great philosopher-king to himself pondering his own existence, mortality, meaning, and inability to change things. It's also quite insightful to appreciate that perhaps the most powerful person on Earth at the time struggled with the exact same issues that affect us all.
He wanted to change society for the better, but ultimately even a man in his position was unable to move a mountain no matter how much he tried. His life was filled with external perceived successes and internal failures. He not only failed to ultimately better society, but could not even better his own son. Aurelius is regarded as one of the greatest leaders, his son Commodus - one of the worst.
When Aurelius died, he was deified and praised. After his son Commodus was assassinated at the age of 31, he (Commodus) was declared an enemy of the state, his name stricken from record, and public imagery of him destroyed.
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[1] - https://files.libertyfund.org/files/2133/Aurelius_1464_LFeBk... #That book includes two introductions which provide extensive context and other information which is quite important to understanding a fair amount of what is said. Aurelius' writings themselves begin on PDF page 59, which is page 25 in the book's ordering.