Dealing with Misdiagnosis: How to Get Corrected Diagnosis?

Has anyone dealt with feeling like they were misdiagnosed? How do you go about trying to get that corrected? Specialists are so tunnel vision in their area of expertise and primary cares who can look at the whole picture know a little about a lot of things, but are expert in no specific specialty especially rare conditions. I recently received a new diagnosis about two weeks ago and the more I learn it’s a much better fit and is making me question three or four diagnoses I got over the last three years.