How can a person persuade him to live well if he wants to die?

Tell him that he lives to fulfill his mission. If you don't finish it, don't do anything that hurts your life without authorization, otherwise you won't be happy and you will fall into a more helpless cycle. Tell him that life is not something you can design and change at will. Death is not liberation, but a new beginning of another life form. Suicide, on the other hand, will make you continue to devote yourself to reincarnation and keep honing until you complete your mission. Tell him that life is endless, life is not a static existence, and the growth of the soul needs love and sunshine.