I subscribe to optimistic nihilism. There is no point to any of it, so we can assign any point to it that we like. And therein lies the secret. Happiness tends to be the result of something positive. Make your life about bringing positivity into the world and success in that should help improve both your happiness and the happiness of others.
However, happiness is always temporary. Left alone or behind simple contentment. From there it always has a chance to slide into stagnation.
I think a lot of the problems these days are that it is a struggle for many just to reach what society considers basic standards of living. Happiness is hard to get if needs are not met. However, driving away the misery of poverty and acquiring happiness through wealth are not the same things. Yet our society is hyperfocused on wealth as an indicator of success. People chase that success believing it will bring them happiness, but instead they find more of a hollow victory.