Fixation makes you look needy. If you cannot have something and you show hunger, you hand power to the gatekeeper to raise the price, delay you, or enjoy your discomfort.
Practice disdain. Withdraw attention. Display indifference. Treat the prize as beneath you. This reverses the emotional leverage. People often chase what rejects them, and they often devalue what begs.
Disdain also protects focus. If you still want the prize, pursue indirectly through alternatives, time, or another route, without revealing urgency. The goal is to keep desire from becoming visible weakness.
The best revenge is denying them the satisfaction of your need. Silence can humiliate more than argument, because it refuses their frame. Ignoring can also preserve your dignity, which is often the real asset at stake.
You do not have to truly stop wanting something. You have to stop advertising that you want it. What you cannot have should not be allowed to control your posture. Contempt costs little and can break traps built on making you beg.