Think of the four Brahma Vihārās, the four supreme emotions, loving-kindness, compassion, appreciative joy (joy with others), and equanimity. And see them, as the Buddha explained them, as the only emotions worth having. Nothing else has any real place in our hearts. And think your heart as yearning to be filled with love and compassion, with joy with others, and equanimity. See your heart as yearning for that and then fill it with those emotions. The warmth of love. The care of compassion. The generosity of joy with others. And the peacefulness of equanimity. Fill your heart to the brim.