If it doesn't work, you have to operate. The operation is not terrible, the clinic can solve it, and it is relatively small. Spray some anesthetic on your throat, and then clip off the extra nodules with special pliers.
If you are a teacher, singer, etc. You need to be more careful about your voice. It is suggested to use self-supporting laryngoscope or fibrolaryngoscope. It is more accurate to remove it under TV monitoring, but the cost is also higher, and most of them need hospitalization.
You may not believe it, but the cost of treatment varies greatly. In Shenzhen, if a familiar doctor agrees to do it in an outpatient clinic, the cost is 200-300. Some people may have to be hospitalized, and the cost can be around 2500-3500.