Possible remedies would depend upon the cause of the laryngitis. Laryngitis is usually a symptom of something else, so its remedy is usually going to be to treat the cause. It might be antibiotics if an infection is the cause, or it might be to refrain from speaking if over-use or abuse of the vocal chords is the problem. Laryngitis due to an injury might be treated by some sort of physiotherapy or non-use or surgery, etc.
Ultimately, you need to have the cause diagnosed by a physician and treated as directed.