Personally, i would say that if there are no issues with your current metal ceramic crown, leave it like that for a while. In order to give you a new ceramic crown, we have to remove the old metal ceramic one. But removing a crown comes with certain complications. The tooth inside breaks at times while removing the old crown.
Next Steps
Get the tooth assessed by a dentist. Complications do not always arise, but you never know. It could be your bad day and if the tooth breaks, then you might have to go for removal of the tooth altogether. So make a call carefully after discussing with your dentist.
Health Tips
Sometimes, the crowns get dislodged or come off on their own. That will be a good time to get ceramic crown done. The cost varies from 6000 to 15000 depending on location, doctor, material, warranty etc,