From the Ask Tom mailbag:

Question:
I have been following your blog for a while and I have learned a lot. My question is a bit unorthodox, but here goes. My manager is very happy with my work, but is hesitant to give me more responsibility. I know he is afraid that if he does promote me, and it doesn’t work out, it might be a bit of a mess. The problem is that I feel like I have reached the peak of my position, and I am ready to move on. Tom, how can I show him that I am ready to start moving?

Response:
This is a dilemma for every manager. If we promote people and they fail, we have to fire or demote, neither of which is in our best interest. I will give you the same advice I give to those managers. Volunteer for project work.

Project work allows both the manager and the team member to experiment with designed task assignments that might be a stretch in capability, skills or interest. If the project works, everyone is more comfortable, trust based on evidence of success. If the project fails, then we just have a failed project. No firings, no demotions.

So, it is time to schedule that conversation. The risk in not having the conversation is that you will remain frustrated, it will impact your work and relationships. In the end, you will move, one way or the other. We all do.