Something this seemingly elusive must be actively hiding from us; probably hiding in plain sight. In other words, hiding in the place we are least likely to look. As in: the very thing we believe is helping us find this answer is actually what is keeping us from it.
A “better life” is never more than a better experience of it, not any quantifiable aspect of it. “Better” is what you, and you alone, know about your life. It is not measurable, nor does it ever need to be. Measuring is only necessary when you want to communicate value to another. But your life is yours alone; it can never be experienced by another.