I agree that it seems impossible for us to reconcile God's almightiness and his goodness in our mind amid a world with so much suffering.
Yes, the problem of evil is the hardest problem to theists. It's the "something ex nihilo" to atheists. Why there's something instead of nothing?
But there's some light about the problem of evil.
The possibility of evil is a requirement for infinite free will. In our minds we can choose anything freely. Even things with hard consequences (like defy gravity by jumping from a building).
God is infinite liberty and infinite good.
If He's good why there's evil?
There's no choice in infinite liberty. Because nobody would freely choose involuntary slavery instead infinite liberty. Doesn't matter if one is good or evil.
But good and evil are choices. God chose to be good. And He created our sense of infinite liberty like His image.
If God had put a barrier to evil, infinite liberty would be damaged.
It's just like an architect designing a balcony in a high building. The goal is to achieve a free view but at the same time someone can jump from there. Jumping is not what's intended but is an intrinsic possibility.