As long as you feel very comfortable with the tasks that you do you don't grow. If you want to grow you have to challenge yourself. You should feel uncomfortable with new tasks on a regular basis because otherwise you've been there, done that. While it feels good to be comfortable with a certain task it doesn't help you to grow. There are many routine tasks that everyone needs to master in every job and they are good to build confidence but if you want to grow you have to leave this path on a regular basis.
In today's and tomorrow's workplace you have to keep learning/growing and if you want to have a successful career you have to do that while you are working on your relationship skills.
What do I mean by "feeling uncomfortable"? I mean for example that somebody might assign you a task that you feel is too much. You might think you can't do that but instead of looking for excuses or other ways to get out of it you actually sit down think about how you can approach the task. Who in your network can help you? How can they help you? What sources can you use to come up to speed? Don't accept a "no" from yourself. To make this work you have to be honest with yourself. For example if you know how to write a Software Program and somebody wants you to build a rocket you are in over your head. In this case the challenge is unrealistic! You should know yourself well enough to prevent these unrealistic to prevent unnecessary frustration. Now if somebody asks you, as a Software Programmer, to improve the performance of a critical program that somebody else has written in 2 weeks. Now that might be difficult, you might not have done that before but this is in your area of knowledge. All you need to be successful is determination and perseverance. Maybe you need others to help. The goal is to make it work and be responsible for it. No, you can't do everything yourself but you can be responsible for making it work. Take on this responsibility and grow. Don't wait for these tasks to be assigned to you. Look for them! Make sure you always have something that gives you an opportunity to grow.
You will gain much more self-confidence from these tasks than you get from the routine tasks you do today. The challenges of today are the routines of tomorrow.
