Hello!
Path to Apple Card is an invitation only program. If you received an invitation, but accidentally declined it you may be able to contact Apple Support for enrollment, however you will most likely have to wait for another invitation to the program.
Please keep in mind:
"Not all declined Apple Card applicants will be invited to participate in Path to Apple Card, and completion of the steps in Path to Apple Card does not guarantee that you will be approved. The credit policy, program terms, and monthly emails for Path to Apple Card are managed by Goldman Sachs Bank USA and created to help customers get approved for Apple Card. For more information on the program, see About Path to Apple Card - Apple Support" - Apple Card - Financial Health - Apple
I hope this answers your question!