well I'll just make it simple and list down what needs to be leveled eventually:
Nanaly, Sybilla, Olivie, Deine, Dahlia/Clissa, Gellius, Spica, Odette, Liddy, Horus/Charlotte, Garania/Solano, Conrad/Lyla, Iris-Fedora-Cloris-Yuyu-Katie, then bernice.
general priority: black > plat > gold (those close to max level may do so first)

those already high level but mentioned above = get to maxed, or 60+ preferred at the minimum. Frankly speaking you should've skipped Gold rush is favor of powerleveling your units, IMO. as a wallet warrior, you already have most if not all of the golds from gold rush, and you dont really need them either. AW fodder is a far off issue when your team isn't even ready to clear G tier maps with ease as well as AW maps.