Once I wanted a role change. I worked on it with my manager, tried to pick up work related to the new role, set career plans, all that stuff, for months. Couldn't quite get it done because I always wound up paying more attention to the duties of my current role than the one I wanted.
Interviewed with a different group for the role I wanted and got it with a few hours of interviews. It was absolutely not the case that I learned anything relevant from my experience trying to switch roles on my current team. It absolutely was the case that the 3-4 hours of interviewing (plus luck of the draw on my interviewers and their questions) meant way more to my career than months of planning and effort.
Interviewed with a different group for the role I wanted and got it with a few hours of interviews. It was absolutely not the case that I learned anything relevant from my experience trying to switch roles on my current team. It absolutely was the case that the 3-4 hours of interviewing (plus luck of the draw on my interviewers and their questions) meant way more to my career than months of planning and effort.