After retirement you may not be able to work at the same pace as before, but there are many areas in which you can make a contribution, especially in our churches. The word holy means set aside for a special purpose. You don't use our communion vessels to mix paints. It is a day set aside for wholesome, healthy purposes. For a start it gives us an opportunity to be like little children to enter the kingdom of God.
Children love to play, explore, love and be loved, learn new things.
Without that continuous work becomes a grind and loses its meaning. The true meaning of Shabbath is freedom, joy, refreshment, relaxation from tension. People will ask you why you bother with church. And it is good to admit that there are hypocrites in church as anywhere else. We don't claim to be good people.