From your units you lack a 3rd healer (I don't think Ertel will work as well, guessing you used Dorca as CC fodder?) if you want to go for the 500 map. Outside of that you have the needed units to take on the the last 100. You will mainly want to level Bernice, Claudia and your choice between Imelia or Themis as a secondary tank for the Liches that you want to prepare for by 470 to be ready at 492.