Build a perpetual incentive system around faction mobs.
Suggestion 1; Each faction can build energy against other factions through killing faction mobs which can be seen through some UI. (utilize alerts sent though discord roles to alert people indiscord / ingame when enough energy is built up. 25/50/75/100%) Each faction mob kill builds 1 energy, at 100 energy a faction receive an empower buff AGAINST the specific faction for a small window of time for retaking flags / calculated control (king of the hill / CTF / ect.)
Suggestion 2; at 100 energy build up, for 1 hour the specific faction receives double silver for killing faction mobs.
-> incentive to defend faction mobs / actively reduce energy.
-> huge pressure on a single faction that's dominating as you have to defend against 2 factions.
-> Allows weaker factions windows of strength for reversal in power.