What promise does Medea make at the end of her speech?

At the end of her speech in Euripides' "Medea," Medea promises to take revenge on Jason by ensuring that he suffers for his betrayal. She vows to enact a terrible punishment upon him and his new bride, showing her determination to assert her power and agency despite her loss. Medea's promise emphasizes her resolve to not only avenge herself but also to challenge the societal norms that have wronged her.