How to overcome a monotonous work which has been performed for years in order for the job satisfaction?

Organizations or Administrators can utilize the concept of 'Job Rotation' which means moving  workers from one role to another after some time. Job rotation not only helps in improving the knowledge and skills of entire workforce but also results in less 'job boredom' and higher job satisfaction.

Moreover, Organizations should also have good Career Progression system which means workers should not be working on 'dead end jobs' rather they should be moved to higher up in the organizations hierarchy. A monotonous work can also be changed by giving some additional responsibility such as some managerial or supervisory role. 

HR Manager and Leadership have central role in designing jobs, career progression system in such a way that workers do not end up in monotonous work.