Daron had lived through 2 lives before so now, in a third, he has everything he needs to become great. It's just a matter of fighting his way to the top with what he now knows, but that might be a bit hard when he has to start from the very bottom. From the F- ranked monster the Horned Rabbit, to something great, but it isn't like it's impossible after all the Demon King in his last life was a Horned Rabbit too...