Apply to the hospital for transfer to radiology, but after transfer, you must be the most junior doctor in this department. If there are basically no radiologists in this hospital, you can start with it. Otherwise, you have to ask someone younger than you to be a teacher.

Postgraduates majoring in imaging can also enter the imaging department, but the level is still not high. In fact, if you are promoted to an attending physician, you must have been a doctor for more than five years. It's really hard to learn from scratch, and I have to be a resident again.

Being a pediatrician is hard, harder than other clinicians, but earning little money. If you really don't want to do pediatrics, I support you to change careers.