The way to happiness is most commonly found when we treat others really well, love them, cherish them and serve them. If you want to be happy, try doing that. That in itself would transform marriage, if both partners would accept that challenge. We are happy when we do for others and when we seek our own pleasure or happiness, we tend to make ourselves miserable.
Every major religion has stories to teach that concept.
When people used to initiate their young men, one of the first lessons was, “Your life is not about you.”
If they did not get that lesson at that point, they sure did once children came along!
Look at the current problems you have in your life, work or relationship.
Are those problems due to you wanting to be happy and someone thwarting your will?
Are they due to others not behaving in the way you think they should behave?
I challenge you to serve them better, listen better and put your needs aside and observe what happens next. This is a challenge for most of us.