Like Koshka said, if the only ones you CC'd early were silvers, they can be kept as AW fodder later on and it's not an issue, they're generally farmable when the right event comes along. Gold+ on the other hand... That would be bad.

Katie (assuming you didn't screw HER over) is a solid option for a long time, mainly held back in the long run by being nearly impossible to Cost Reduce. She can hold the fort for a very long time though.

Spica is a HIGH priority for you but that will take 200 DC, which you may or may not be readily able to farm (how high a Crystal Keeper map can you handle at the moment? I'm guessing no farther than H if that)

In the meantime, outside of Thursday (prioritize Crystal Keeper on Thursdays) farm event final map for Soma copies and you should be fine on Archers until you get Spica (then you'll be REALLY fine ^^)