“have not sought Yahweh or asked anything of him.” Genuinely worshiping Yahweh means more than going through the motions of doing the sacrifices and things He requires. A true worshiper believes Yahweh exists and cares for His people, and so they seek a relationship with Him and ask things of Him in prayer. So Zechariah 1:6 gives us another proof the people did not worship Yahweh in their hearts but had another “king” and other gods, because they did not ask anything from Yahweh.