For real, if i were you; id run magma and nest with 3x combo (with an optional 1.5x combo via gold, cuz as Giaz mentioned, its really helpful) continuosly till i reach 76. If you grab the Luck Gods leg, youll get some good drops during that long journey.

From 76 to 77 without plat? Forget it, theres no fast way. But you could join to a solid konz farming group for xp & loot.