You can mail the return again and use a certified mail so that you have proof that it was mailed and received. The IRS is very behind with paper returns due to COVID-19. If they get two paper copies of the same return, they will just ignore one of them.
When you print your return for mailing the first page will be a cover sheet. It will tell you which forms to mail with your state return. It will give you the mailing address. Remember to sign and date the return, or it may be returned to you for a signature.
