Cervical cancer vaccine

If you are of reproductive age, you probably have received the cervical cancer vaccine almost all. These days, it seems like they are administering the 9-valent vaccine, but I received mine about 8 years ago and remember getting the 4-valent one. For those who received it before, did you get re-vaccinated?? The obstetrics and gynecology department says that additional doses are recommended, but the cost is expensive, and I'm not sure if it's really necessary~~