A simple technique to reset it is to activate the "sigh reflex". You just breathe in twice at a normal pace and then slowly exhale through the mouth.
Another more powerful reset is to do yoga nidra for 10-20 minutes. Yoga nidra, once you figure it out, will actually deactivate the prefrontal cortex and simulate sleep. Which has a huge boost for your cognitive abilities.
Both of these techniques will increase serotonin and dopamine in the brain which will decrease norepinephrine. Once norepinephrine is no longer saturated you can become energized by it again.
For example, imagine a football team winning the super bowl. They've been pushing 110%. Suddenly, they're jubilant and jumping all over the place. The dopamine and serotonin pushes out the norepinephrine allowing to return and become effective again.