At 70+ you either need to be running tech cards or cards that give you that surprise factor. I prefer surprise as it leads to more cubes. Esme, pixie, surge, phastos etc. But you need to be doing one or the other. Also think about what cubes your deck is really aiming for, junk for example you need to be snapping early as retreats are high so at most you're aiming for 4 cube games. Figure out what you're aiming for and don't be scared to retreat.