What are other ways to say the end in a story?

Well, you could also say 'it's over and done with', 'that's the final word on it' or 'case closed'. These expressions are often used to signify that there is no more to be said or added regarding a particular situation or narrative. For example, when you've finished explaining something and don't want any further discussion or argument, you can use one of these phrases to make it clear that the matter has been fully addressed.

The end. It's a simple and straightforward alternative, just like 'end of story' but more concise.

Some other ways are 'narrate a story', 'relate a tale' or 'recount a story'.

Well, 'mournful story' is one way. Also, 'gloomy yarn' and 'melancholic anecdote' can be used instead of'sad story'. These expressions not only convey the basic meaning of a sad story but also add a bit of a different nuance. For example, 'gloomy yarn' gives a sense of a story that is not just sad but also has a kind of dark and dreary atmosphere around it, like a story told on a foggy, cold night where everything seems a bit more desolate.

Achievement tale.

You could use 'next', 'afterward' or 'subsequently'.

Well, you can also say 'and that's the conclusion' or 'it's over'. Another way could be 'the finale'. When we talk about a story coming to a close, these expressions can be used interchangeably. They all convey the idea that there is no more to the story, that it has reached its final part.

Some ways to say 'end of story' are 'the end', 'that's all there is to it', 'and that concludes it'.

You can say 'compose a tale' or 'create a narrative' or 'craft a story'.

Rooted in actual events. For example, in the movie industry, many films claim to be 'rooted in actual events' which is a way to say they are based on something that really happened in real life. It gives a sense of authenticity to the story.