I would sell the FFQ/Hope and the mono-Aether and use the money to upgrade the cards necessary for ScaredGirl's FG Rainbow. If that's not enough money, I would use the T50 killer to farm T50 for money.
In my experience, I can upgrade 1 card every 2-3 hours of T50 I think.
But for now, because of the T50 not working, I would use the Mono-Aether and farm AI5s.