This verse is a response to the question posed in the previous verses (vs. 3-5), which is a question for all people in every age, 'What shall I do to please God?'
Micah answers the question by posing several questions concerning how much sacrifice is enough to offer to please God, and he proposes possibilities ad absurdum. In other words, there's not enough sacrifices one can offer, not enough good one can do, to please God.
So the answer to the original question as answered in this verse is that God desires a change of heart that expresses a reaction to his redemptive acts toward His people:
do justice,
love kindness,
and walk humbly with Him.
The best way to please God is to administer grace and forgiveness to those seeking redemption.
