i know it's rather late , but i'd suggest u cc katie instead of julien. Julien is pretty meh as a soldier. Meanwhile katie is 1 of the best (she's probably the unsung hero of aigis) unit in the game (well , ofc , unless u get the plat soldier). I'd suggest cc-ing a healer asap as well. Since i own both fedora and iris , i believe iris is better. I mean fedora is more versatile since she can be positioned a bit farther away and leave a chokepoint free for another mage , and her stats are generally naturally higher then iris , but from personal experience i found that burst healing is better most of the times , which is something iris can do with her active.

Now , if u have at least 1 archer cc-ed , 1 healer (should prob go for 2 since most events require at least 2 healers cc-ed. 2 archer would be great as well btw) , i'd cc deine. Deine is a monster of a tank , and she is one of the most broken units in the game , along nanaly and probably sybila (i'm personally jelly on that deine). After deine , i'd probably cc the gold mage girl. (i personally like her skill , and the fact that shes a female means that affection items are easier to get)
Well , this are my 2 cents , so ofc , you can do things your own way , at your own pace. That being said , u have a pretty nice selection of units there , and u should be able to lvl quite quickly , since those are strong units