The reason why " Water Moon Paradise 3: The Legend of the Underworld " was not filmed was because of insufficient funds. He had spent a lot of energy on the script creation, resulting in insufficient funds. He could not make any major breakthroughs in the costumes and production techniques of the TV series. Furthermore, the viewership ratings for the second film were not as good as the first, and the story had already reached its end. There was no possibility of continuing to write. In addition, there were reports that the company's bankruptcy was also one of the reasons why " The Legend of the Netherworld " could not be filmed.
Sure, the Sailor Moon manga is finished. It wrapped up nicely, giving closure to all the characters and their adventures. But you can still enjoy re-reading it or exploring related merchandise and media.