This form is generally used for recovering an account which is disabled or deleted for violating Instagram’s community guidelines. But after following the first step which is downloading older version of instagram app and attempting login, filling this form will really help you getting your account back if your account is deleted in the past 90 days. So fill this form with your full name which you entered on your profile, username of deleted account, registered email id, country, contact number with country code and in the section of describing your problem, just mention that ” By mistake I have deleted my account permanently, I was trying to temporarily deactivate my account. My account was so important for me, please help instagram team and restore my account”. After that submit the form and then just wait for reply from Instagram support team.