A person can have everything they wanted and still focus entirely on what is missing.

Getting what you wanted does not automatically redirect attention toward it. The mind keeps scanning for gaps, which was useful when gaps were dangerous and is less useful now, and so a good situation can be experienced almost entirely through the one part that is unresolved.

List what you have that you once wanted. Read it slowly rather than skimming. Then decide how much of your attention the missing piece actually deserves, given the rest of the page.