Compassion without attachment is the perfect cause. Knowing the nature of unborn mind, and knowing the illusions of sentient beings despite the fact that their minds are also unborn, you will bring about the perfect result.
This is because as long as sentient beings have self-clinging, they have the illusion of suffering. Therefore, the opposite of suffering is equally true for them —they also can experience the illusion of getting help. For as long as they have the illusion that they can be harmed, they have the illusion that they can be helped, and they can gain happiness from someone who is helpful. Now, on the basis of that illusion, you can be helpful.
Grounded in genuine compassion and loving-kindness, you should make wishes for the well-being of all sentient beings so that every single one without exception can receive your help.