It depends on the purpose of the story. If you want to fully develop the ideas or characters, then adding more would be a good idea. But if it's just a short anecdote, it might be okay as it is. However, if you do add more, you could explore different aspects like the emotions of the characters or the consequences of the events in the story.
Sure, adding more could really enhance it. You could start by going back to the beginning and adding more details about the situation that started the story. Then, you could add some dialogue between the characters if there are any. This would make the story come alive more and make it more interesting for the listener or reader.