As long as we don't change the inherent disadvantage of the enemy being strong while we are weak, the enemy hidden while we are exposed, and being in a passive defense position, strategic initiative will always be in the hands of the opponent.
To defeat the opponent, we must "expel the external threats" and "stabilize the internal situation"!
Externally, we need to find the enemy's lair, strike first to turn our passivity into initiative!
Internally, deal with the enemy spies first.
Unless we can root out all spies from the Night Demon Clan and prevent them from undermining humans internally, should we overly provoke the Night Demon Clan, they are likely to use various means to diminish humanity's war potential and launch attacks from behind enemy lines.
Next, we need to promote world peace...
...,
Watching the world slip into an abyss in my hands, becoming ravaged and scarred.
I helplessly challenged fate for the last time!