Be the first to say "Hi!" Don't wait for someone else. Be the first. Compete with yourself -- Can you be first all day?
It is an emergency to see someone alone at church. Take initiative to talk with someone who is by themselves.
Send a note or a text to someone who is hurting and say, "Sorry for your loss." Pray for them while you do.
Remember one Christmas card you received. Find that person's address and write them a letter/note. Pray for them as you write it.