do you have another duelist?
if not, then you can use Listis as a replacement until you get duelist. Her skill halves current HP and give her range attack.
I dont have avenger so i cant say much about them, they're great for fighting something that can almost kill them but give some time for them to be fully healed.
well, its not like you cant bring more than one tank lol.
Palfy serve different role than Alicia anyway.