No, mailing your return probably will not fix the rejection issue with your return.
You mentioned that you purchased your EV from your father. Unless he is a licensed dealer, then your purchase does not qualify for the Used Clean Vehicle Credit. (If he is a licensed dealer, then there is a problem with the information submitted with the IRS at the time of the purchase and mailing your return may help.)
Take a look at the following information from the IRS with regard to the qualifications to claim the Used Clean Vehicle Credit:
Used Clean Vehicle Credit