It is not important to work hard, it is important to be happy. Stop glorifying the act of working, please.
To me, a lifelong search for happiness seems flawed and ephemeral. It's culturally very American, but doesn't seem to lead to happiness. I strive for purpose, meaning, and positive impact. When I succeed, I'm happy. That drives how I pick my job and how I run my family life. The Frankl book "Man's Search for Meaning" makes a good case for this as a life goal. I'm not going to my categorical statements like yours. But…
Doesn't that mean that being a good person and having a fulfilling life is what makes _you_ happy?
This is something I think a lot about, and I know this is a philosophical topic that has been around for ever, but how do we call the state in which we're "ok" with our life? In your case the mental state when you believe that you're being a good person and having a fulfilling life? Is that happiness? Or is happiness a by-product of that state?
I believe this is what Aristotle called achieving virtue, maybe, it's been a while since I studied philosophy...