Is it possible to make yellow eyes white again?

Yes, for infants. In most cases, the jaundice in infants improves within 1 to 2 weeks. It is usually physiological (natural). Using "bili tool", as a guide, the infant's jaundice can be treated with special lights, if the jaundice level is high (bilirubin blood test). Every infant discharged home within 72 hours of age needs to be reevaluated for jaundice within 48 hours--> the current standard of care and safe.
Yellow eyes. Some yellowing of the eyes can be normal. I would recommend getting your liver enzymes checked, stay hydrated, use regular artificial tears and as needed get-the-red-out drops. If no improvement, see an eye doctor.