If your App is not listed in the App Store, it could mean that your Developer Program Membership has expired. However, this is just one of several possible reasons for app unavailability.
Below are quick steps to renew your membership for your app to appear.
Pull up your Apple Developer website.
Log in with the user for the Account Holder role.
Click the option to renew your membership.
Verify your Apple Developer account is active and compliant.
Check for any pending agreements or billing issues, and resolve them in App Store Connect > Agreements.
Once renewed, it may take up to 24 hours to appear in the App Store as the app may require time for full population. During this period, the app will eventually be labeled “Ready for Sale.”