Gst composition scheme

I AM A COMPOSITE TAXPAYER, I HAVE AOPTED OUT FROM COMPOSITION SCHEME ON AUGUST 1ST 2018, AND THE DASHBOARD FOR MONTHLY RETURNS IS AVAILABLE FOR ME FORM AUGUST ONWARDS, NOW ALL MY DOUBT ARISES FROM THE POINT THAT HOW TO FILE MY GST RETURN OF JULY MONTH. I TRIED TO FILE THE JULY TURNOVER IN THE JULY-SEP QUARTER AVAILABLE IN MY DASHBOARD. BUT IT IS NOT HAPPENING AND WHAT I HAVE TO DO WITH THAT QAURTER DASHBOARD AVAILABLE