Unable to Verify Payment Method on App Store After Multiple Cancellations

I am trying to download apps from the App Store, but it requires me to add and verify my payment method. I have already added my card, but I keep receiving an error saying it needs verification. Recently, I made several purchases and then canceled them repeatedly, which may have triggered a security block on my account. I need assistance to verify my payment method or remove the block so I can continue using the App Store.