Dragon Ball Z's iconic villains like Cell and Frieza have helped drive the series to mythical status in the anime world. Fans remember Goku's battles with them as vividly as the likes of Harry Potter or Star Wars. Modern anime has equally intimidating and impactful villains, and they would perfectly fit within Dragon Ball Z's story.
Source:https://www.cbr.com/modern-anime-villains-perfect-for-dbz/