Trying to add funds to apple cash without debit card

Hello kingkaimky,

Only money from debit or prepaid cards can be added to your Apple Cash Card - Add money to Apple Cash - Apple Support

"You can't use credit cards with Apple Cash, and you might not be able to use some prepaid cards. You can't add money from a gift card, even if it's already in Wallet."

How to add funds to apple cash from apple account

And to approach this from another perspective, normally once funds are in Apple Account balance the only way to get them out again is to spend them.

From: Check your Apple ID balance - Check your Apple Account balance - Apple Support -->

"About unused Apple ID balance

You can't redeem or return Apple Gift Cards, App Store & iTunes Gift Cards, or unused Apple ID balance for cash, except as required by law. If your jurisdiction allows for refund of redeemed gift balances, you can contact Apple Support." Read the support article for more details.

The above excerpt only mentions gift balances as being eligible for refunding, and only in limited places where laws may require that. Read the support article for more details.