1: sponge armor and all slime armors(bar knightslime) reduce fall damage
2: more traveller's gear for boots
2a: obsidian plates for faster falling that can damage mobs
2b: fireworks for superjump with a cooldown
3: heavier armor type that gives better defense(1.5x), but slows you down and requires more than one plate piece and fitting piece

addendum to the heavier armor suggestion: should only be made at an armor forge