I'd take a different answer to this question: philosophy. In times before Abrahamic religion developing or adopting a life philosophy was seen as a practical obligation for a man. This is where you saw the rise of everything from the Pythagorean to the Stoics. It seems that the rise of Abrahamic religions is what largely brought an end to this and mandated a sort of one-size-fits-all philosophy for everybody.

Now in modern times many people have moved away from religion, yet most aren't replacing that philosophical void with anything comparable. And I think this naturally leads to things like hedonism which is completely unsatisfying over time, or even nihilism which is even less satisfying. One could even argue this issue is directly related to the collapse of fertility in developed nations.

I think that a personal life philosophy is absolutely critical for having a contended life. And I use contended instead of 'happy' as part of my own philosophy of life. I don't think happiness is or should be a goal. Happiness is a naturally liminal emotion. And seeking to extend it is only likely to leave one 'unhappy', so to speak. So instead I think we should pursue contentedness. Being satisfied or pleased with one's life does not mean one is necessarily happy, but it certainly means you're content with it.

The miniscule amount of written work that survives to the present really makes it difficult to do any more than speculate about the philosophies broadly held in the times before Abrahamic religion.

What are you on my guy.

Literally everything you said is the most made up none sense I’ve ever heard. You think the Greeks are pre Abraham.

Literally. Are you high? Dude. Read a book.

Your thoughts are like a toddler attempting algebra.

I think happiness is an inevitable byproduct of honestly following your innate sense of self. Intelligent people can be dishonest with themselves, not know themselves and be (more) capable of lying to themselves and coming up with justifications to do what they mentally want (rather than following their innate sense), thereby trapping themselves in endless dishonest but justified loops.