Here are some ways to handle a frightened cat:

Remove the object that frightened the cat from its sight, or move the cat away from the place that startled it, to prevent the cat from being frightened again.
Gently stroke the cat and comfort it with soft words to calm it down.
Play with your cat, feed it its favorite treats, and distract it to help it recover from its fright.
If a cat remains in this state, it may become thin and even develop illnesses. Therefore, it is recommended that owners promptly identify the cause of their cat's depression and take appropriate measures to help the cat recover.