Increasing personal kills to qualify for ruby tier will be the only way to "encourage" players of all play style to help community achieve Overall Ruby tier.
12,000-15,000 kills should do it.
ZB farmers will risk not getting ruby chest if they have farmed full bp of ZB( Provided they are specificly killing off Halloween Reve only without GB. which will require them 6000 kills to reach 12,000 ) and stop killing before selling off the ZB that is with them.
Same with Titian Hunters. ( Secure 50.1% of titian kills, rest/recover till next Titian Spawn Or hunt with whatever leftover of stam they have to try and reach 12,000 - 15,000 kills. Cant reach Personal Ruby tier while community does? Lose the Ruby themselves. )
Levellers will just have to choose between Potential Ruby Chest reward or couple of level to rise up.
OT: only got 75k+ kills (