"The washing of the feet of chosen men which, according to tradition, is performed on this day, represents the service and charity of Christ, who came 'not to be served, but to serve.' This tradition should be maintained, and its proper significance explained."
washing the feet of the entire congregation, of people "Washing each other's feet (or hands), or doing so in situations that are not visible to all -- tend to undermine the sense of this rite within the concrete context of the Mass of the Lord's Supper.

Such practices, by greatly extending the time required, tend to convert a meaningful, but optional, rite into the focal point of the celebration. And that detracts attention from the commemoration of the institution of the Eucharist on Holy Thursday, the principal motive of the celebration.

In other circumstances, such as retreats or so called para-liturgical services, it can be perfectly legitimate to perform foot-washing rites inspired by Christ's example and by the liturgy. In such cases none of the limitations imposed by the concrete liturgical context of the Holy Thursday Mass need apply."

https://www.catholic.org/featured/headline.php?ID=3155

Christian liturgical calendar, Maundy Thursday or Holy Thursday is the feast or holy day falling on the Thursday before Easter that commemorates the Last Supper of Jesus Christ with the Apostles.
It is the fifth day of Holy Week, and is preceded by Holy Wednesday and followed by Good Friday.
The Mystical Supper, Icon by Simon Ushakov (1685).


https://en.wikipedia.org/wiki/Holy_Thursday


Orthodox icon of Christ washing the feet of the Apostles (16th century, Pskov school of iconography).

On this day four events are commemorated: the washing of the Disciples' feet by Jesus Christ, the institution of the Mystery of the Holy Eucharist at the Last Supper, the agony of Christ in the Garden of Gethsemane, the betrayal of Christ by Judas Iscariot.

The morning celebration of these events marks the beginning of what is called the Easter Triduum or Sacred Triduum. The Latin word triduum means a three-day period, and the triduum in question is that of the three days from the death to the resurrection of Jesus.
It should be noted that for Jesus and his followers a day ended, and a new day began, at sunset, not at midnight, as it still does today in the modern Jewish calendar.

The Last Supper was held at what present-day Western civilization considers to be the evening of Holy Thursday but what was then considered to be the first hours of Friday. Its annual commemoration thus begins the three-day period or triduum of Good Friday, Holy Saturday and Easter Sunday, days of special devotion that celebrate as a single action the death and resurrection of Christ, the central events of Christianity.
https://en.wikipedia.org/wiki/Holy_Thursday
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Metaphysically Speaking washing of the feet would be about
Jesus setting an example that we are all equal.
Feet are also symbolic of the "Spiritual FOUNDATION" and I'd see it as a cleansing and time of renewal of ones life purpose. Go within meditate on what is my PURPOSE?