It really sounds like you don't know what would fulfill you, especially outside the context of a job. For me, that was a sign that I hadn't experienced or done enough different things to know what was missing from my life.
After my first startup job flamed out after going through several different roles and having similar feelings about feeling unfulfilled, I left, spent some of my savings _not_ working, and tried out tasks (some for myself, some for others; some paid, some not) in other fields that I thought I'd enjoy. When I hit on one, I pursued it as a career, at least briefly.
The end result wasn't me landing on my dream job, though over time I did apply and even get an offer for a couple, neither of which fully worked out either. What I learned was that a job in the definition of having a time when you come in and a time when you leave, a boss, a salary, benefits, none of that was fulfilling as a structure for my life.
Unfortunately, from where I'm born and live, and circumstances and consequences of my life, it's more difficult and expensive for me to live in a place where it's feasible ot escape that structure and survive. I make up for it by, unfortunately, working more — but by doing things I enjoy, for others, outside of that structure. I do those things on weekends or by taking PTO or even unpaid leaves to do it while retaining work that I don't love, but at least makes sure I can continue doing what I do if I get sick or need to support someone else.
I don't want to get into what that special fulfilling work is to me, because one thing I've learned about career advice is that each person's dream of labor is at some level nobody else's dream. And I want to emphasize that this is what worked FOR ME; some people ARE fulfilled by the structure, but not their tasks in it; some people aren't fulfilled by labor at all, and won't feel genuine fulfillment until they are no longer required to work. Even in my case, some people are fulfilled by freelance work where the structure is designed by you, others by entrepreneurship where your structure has to constantly adapt, others even by gig work some people consider to be too menial to justify any structure.
So for a "path more equilibrated and focused on happiness I should follow", to me at least, it's something that each person has to discover, and that it takes resources and privileges not everyone can afford. If you can, it also requires time and a willingness to be without a compass, a manager, or even any specific direction while you experience new things, meet new people, and learn about new opportunities and forms of creativity until you come across something that ignites that fulfillment in you.