Raised liver enzymes are the the marker of the liver damage
and if they are persistent for more than 6 months,it comes under the category of chronic hepatitis
Various cause of chronic hepatitis are:
Viral hepatitis: (Hepatitis A does not cause chronic hepatitis)
with or without hepatitis D
Please get some additional investigations done to rule out the other chronic causes of viral hepatitis, as prolonged damage can lead to cirrhosis and permanent damage to liver.