Never let yourself get too comfortable

Finding opportunities to stretch yourself beyond the day to day at work is the ideal way to give your career a boost. However, looking for new challenges is not just about impressing the boss. Taking on responsibilities which push you outside your comfort zone will also boost your own confidence and sense of self-worth.
Taking on new challenges adds more variety to your role and makes it far more interesting than continuing to carry out the same tasks month after month. Any job can become dull without new tasks or projects. Learning how to work on different tasks keeps your motivation and interest levels higher.
A good boss knows that keeping staff motivated is critical for staff retention, so will be happy to support you as you take on new work.