Sound like you are wearing shoes that put your weight on the balls of your feet, and probably have arch "support" (which btw makes the arch weaker). They also probably have tight toe boxes and don't allow your toes to spread out ( spread toes creates a proper natural arch).
If you aren't already, the 1st thing to try is flatter shoes with wider toe boxes. Watch SquatUniversity YT videos on the topic if needed.
Also, if you're calves/hams are tight, and/or your knees stay bent too much and further over your toes, etc... that can also contribute (or be the cause).
Also, toe spacers (with wider toe boxes) can help.
But yeah, standing on one foot playing keyboards in that position for long periods of time can get cha in the feet, knees, hips, back, etc...