Hi @freddyp
Thank you for posting.
According to your description, you would like yo collect form responses and delete it after some time. If any misunderstanding, please kindly let me know.
We can use delay action to control how long would you like to retain the new response.
Flow overview:

Flow in detail:

Using delay action, you can configure delay few days or few months if you want.

Hope the content above may help you.
Best regards,
Anna