In this world you have too many monsters, so learn from nature. Those predators need predators of their own.
Your top animal must be a creature of peace, one who honours the divine creator and all of creation. If your top animal favours destruction and greed you are doomed. It appears that the situation is mixed and that a resolution is required. The clock is ticking. Nature can only hang on for so long and then it your joint future gets locked in to a hellish demise. So, as distasteful as you find it, after all persuasions have been attempted to their logical destinations, the recalcitrant monsters must have new predators to reduce their numbers to something manageable. The the stories of of their demise will be enough to dissuade many from becoming monsters too. You lost your warriors to war, the monsters whom lack chivalry, bravery, humility and grace took over, the good fought back but are losing... time to choose your fate... will you awaken the predator's predators and take that chance to win, or else quake until all who depend on you are beyond help let alone prayer?