What if God is Unwilling?

We believe that God is omnibenevolent (all-good), omnipotent (all-powerful), and omniscient (all-knowing). So how are we to understand suffering, pain ,and evil in this life? If God is all-good, then He would desire for there to only be good, right? If God is all-powerful, wouldn’t He have the power to end all suffering, pain, and evil? And if God is all-knowing, wouldn’t He have the knowledge on how to get rid of all suffering, pain, and evil? So why doesn’t He?