Great question. Jesus did in fact bless his enemies.
He blessed all his enemies when he died on the cross so that his enemies could become his friends. Romans 5:10 puts it this way:
“For if while we were enemies we were reconciled to God by the death of his Son, much more, now that we are reconciled, shall we be saved by his life.“
In the deepest sense we were all his enemies before we were reconciled to God through the death of Christ.
There can be no greater blessing than to have your sins forgiven and to know that you are a child of God. Jesus’ death was the greatest possible gift to his enemies, and not just to the religious leaders who hated but to the whole human race whose rebellion made his death necessary.
Christ has made a way for his enemies to become his friends.
And he himself paid the price in his own blood.
There is no greater way to bless your enemies than this.