Pertaining to complement deficiencies, there is no cure and the treatments for complement deficiencies vary widely. The best course of action for management is usually for a patient to treat the complement deficiency as an immune deficiency and get immunized against the microbe associated with their deficiency (or best candidate).
For complement deficiencies, there is no known treatment, and therapies differ significantly. Generally, the best strategy for managing these conditions entails treating them like immune deficiencies and receiving vaccinations against the specific microbes that cause them (or their closest alternatives).