Tell people what they are before you tell them what to do, or the doing never holds.
Standards that hold are downstream of a status a person already believes they have. Being told what they are, before a single command about conduct, sets the belief; the belief sets the state they live in; the state sets what feels natural, and separate conduct stops being sacrifice and becomes housekeeping.
A people who think of themselves as ordinary drift toward whatever the surrounding nations do, because behavior migrates toward the label. Yahweh does not ask them to earn the title and then hand it over; He assigns it first, and every demand that follows is a request to act like what they have already been told they are. What that costs is the excuse of being average.