what is one way to slow down a story

1. develop action scenes
2. write shorter sentences
3. introduce new characters
4. write detailed descriptions

5. Add more dialogue between characters

6. Include flashbacks or backstory
7. Describe characters' thoughts and emotions in depth
8. Focus on setting and atmosphere
9. Include moments of introspection or reflection by the main character
10. Introduce subplots or side stories that are tangentially related to the main plot.

which of my 4 are correct

The correct ways to slow down a story from your list are:

1. Introduce new characters
2. Write detailed descriptions

only one of the above

The correct way to slow down a story from your list is:

4. Write detailed descriptions