Rav Nahman wrote in the LeM that when one needs compassion from Heaven the way thing to do is to have compassion on others. the difficulty of course is that it is not always so clear how to have compassion on others. But it is clear that when someone asks for help, it ought to be offered as the law is on Purim, "One must give to whom so ever asks."
My approach to having compassion is to try to give to whom so ever asks, but not to seek things to do. The disciple of the Gra, Rav Chaim of Voloshin said it is better to sit in one's room and twiddle your thumbs that go around looking for "mizvot". As Rav Nahman said "the evil inclination is dressed in mizvot."
