I have seen this in many orgs. It is sometimes hard for others to see you in a role other than the one you are in, or sometimes they see you as too valuable in

I have seen this in many orgs. It is sometimes hard for others to see you in a role other than the one you are in, or sometimes they see you as too valuable in your role to let you leave it. I agree with the others that sometimes the path for career advancement can be to move on elsewhere.