
First I'd look into Stoicism. That will put you on a good path if you start practicing it. I personally like 'the little book of stoicism'. It's little but gives a good history of what Stoicism is and how it came to be, and also a lot of actionable advice.
From there I have a ton of other recommendations you can just dm me when you want them.
I was searching for the meaning of happiness, what makes me happy and how to maintain it.
Before reading the book, my mind was wired that programming is my passion (as I've been doing it for 20+ years now). While reading and reflecting, I discovered that DIY is my passion! I love create things and programming was the tool that allowed me to enjoy that satisfaction.