The validity period of my rating expired on 30.06.2020.After expiry, do I have any additional time to revalidate the rating?

No additional time margin is envisaged. Once the rating has expired without the revalidation procedure having been carried out in due time and form, and for the purposes of its entry into force, it shall be renewed at an ATO or DTO for PART FCL licences or at an ULM training centre for ULM licences.