If an interview moved from Active to Ended not by your own doing, this means that the company closed the process from their end. They may have decided to go in another direction or even to not fill the role.

You may only reopen an interview if you were the one to close it.

That said, you may leave a message for the company via the Conversation to express ongoing interest or thanks if you like. While we cannot guarantee the company will respond, your message will be seen.