A big part of problem on Haven is critically low player morale. What usually bring morale down is underpopulation, invasions, fort farms.
To get people back some of morale breakers need to go away at least temporarily. Underpopulation is not what NGD can defeat easily, but invasions can be disabled temporarily until realms stabilize and forts can get without guard captains.
Open wars are good alternative to fort wars when things are farmy.
If we compare RA and Haven in regnum sentinel we can clearly see the disbalance:
https://www.regnumsentinel.com/en/haven/statistics/
Alsius have 265 invasions and 76 wishes on last 90 days. This is nearly dragon wish every day...