How about adding some new mini game quest rewards?
( i just giving ideas the rewards ect... be adjusted)
Something like
1) win 5 mini games of your choice (reward 4 mastery points) cooldown 4 hours
2) win 5 mini games of your choice (reward chunk of pvp xp) cooldown 4 hours
3) win X amount of mini games of your choice (reward x amount of pvp T2 tokens) cooldown long
When mini game quests are on CD there is a % of the player base that log off and another % that just play solo for kills
Give more quest rewards more reason for players to actualy try and win the map objective and speed up grind