Your growth as a musician is an upward angle as you reach forward to learn more and play and sing faster and better. Periodically, though we have performances and then we cease trying to grow (other than as a better performer, a better communicator of our music) and step back in to what we do well. Your performance is perceived as excellent when you play in the top third of your ability (but completely within that ability). So, take an assessment of your ability in that window of time just before your performance, consolidate into what you can do dramatically and well, and max out your performance by making music you have a good expectation of nailing. And when it’s over, pick up your pack and head back out on the trail of musical excellence, ever upward.
Move fingers only. Use finger muscles to push keys or strings down; try to leave the hands as motionless as possible. Isolate muscle motion.