Need default VPC restored

If you delete your default VPC, you can create a new one. You cannot restore a previous default VPC that you deleted, and you cannot mark an existing nondefault VPC as a default VPC.

Reference: https://docs.aws.amazon.com/vpc/latest/userguide/default-vpc.html#create-default-vpc

Is there a reason you want to use the default VPC? I'd highly encourage to move away from default VPC as it's not recommended and is a bad practice to use mainly for security reasons.