Honestly, your units looks solid enough that I would personally push Monica up to very high on the list. In the long run, her passive DC gain will give you the most benefit, and the sooner you awaken her, the better. Along the same vein, I'd push Spica's level up to 70+ so that you can do Crystal Keeper X for more DCs.

Then, I'd awaken Olivie for the buff to elves and level her a bit for increased HP (her only real weakness). It will also make Spica cheaper as a bonus.

If you awaken Olivie, the next best in line is naturally Yuyu for the synergy. If not, you can skip her (or if you really want to keep using Cloris - although I'd personally go with Yuyu).

Alternatively (or afterwards), you can work on and awaken Imelia, who is a really good tanky bandit as your main physical duelist.

Fedora after that for the extra healing and reduced cost.

Elizabeth after that, the extra range from awakening will make her more versatile, although in general she's quite good enough even without awakening, so there's not as much of a priority to work on her (the only reason she's somewhat low on the list).

After that, I'd work on Saki or Horus... I personally prefer Saki, but either is fine, you just want a really solid range melee unit.

Then Len and Waltz for their supportive abilities...

... then Awaken and max out Bashira for stat gain (you will have to put in a lot of effort to level her to make it worthwhile, which is why this step is so low in priority).

At that point, I'd focus on padding out the stats of your awakened core units (Spica, Bernice, Iris, Fedora) by leveling them to higher levels (max if possible) before moving on to more "luxury" characters...