If there is a new Christian in your church, ask how they are going and how you might help meet any needs they have.
Ask anyone you come across in your church, who seems to have some longer-term tension with another person, to tell you one or more positive things about that person, then encourage them to communicate those to the other person in some way.
Make eye contact and shake hands or greet someone from your church with whom you have had even the slightest relational tension and ask how they are going generally or with one of their specific areas of interest.
Acquire a high quality illustrated story Bible and begin reading it on your own (and with family or friends) purely for the simple enjoyment of the stories of God's journey with his people.
Ask your congregation/small group/team/family/friends what unique gift they personally brought to worship this week with which to bless God and encourage the church.