Anyone know a good place to grind? Right now, I'm doing Superior Practice 6 for the high exp and 7x exp fodder farm. Trying to get all my unique units up to at least level 50 since I keep getting owned in the highly advanced After Festival battle. My commander is at level 40 with commander skill as Guardianship of Ground and slots with Counter Fire, Impure Miasma, and Elf's Prankish.

This is my current all-unique units team so far (was very lucky to get a SSR+ Michelle in plat ticket summons):


I also have a rare Lilium, Shirley, Sin, and Felicity at level 50 and waiting for their fodders to rank up. Sin will probably get replaced by her SSR copy in my current team.

Any further advices where to go from here? Haven't been too lucky with silver summons and keep pulling all but the higher rarity of the unique girls.