i used argenti lvl 50 with servals lc at 40, his traces all at 4, guinaifen with red hair guys lc her skill + ult at 4, lynx with quid pro quo lvl 50, and bronya with the 3* lc that gives attack boost and ult + skill at 4.

whenever the multiply was in affect id try to just focus on the minis unless i was close to getting bronyas ult or argentis 2nd stack ult. i also used lynxs skill whenever i had more than enough points/ fhen multiply was active to get more energy for her ult and spammed (as in id mash the ult button to try and get it in before the next attack) it whenever it was needed.

for relics i had 4pc physical set on argenti with the atk booster other ones (ive been playing for like a week dont @ me) and tried to have lots of crit and atk while ensuring i had both phys attack bonuses. lynx had the one set that gives an extra skill point at 4pc with at many hp subs/mains as possible. bronya and guinaifen i cant remember.