Farming has long been the best way to grow. You’re focused on expansion. You’re only taking retals. It’s less wasted resources going into rebuilding military. You’re gaining land while others are trading it back and forth with very small gains and losses.
So my idea, when you make an initial attack and win, gain some extra new land. This does not apply to retals. Gives more reason to attack. With this, also decrease the amount of buildings destroyed when attacking.