Here "hand" represents the power or results of sin. Bildad implies that God killed Job's children because of their sin. AT: "for God caused the consequences of your children's sins to kill them" (See: [[rc://en/ta/man/translate/figs-metonymy]] and [[rc://en/ta/man/translate/figs-explicit]])
Bildad is saying what would have happened if Job had correctly spoken to God, but Bildad does not believe that Job really did this. (See: [[rc://en/ta/man/translate/figs-hypo]])
# diligently sought God ... presented your request to the Almighty
These two phrases both refer to Job asking God for help or pleading with God for mercy. (See: [[rc://en/ta/man/translate/figs-doublet]])