Transfer Apple account funds to Apple cash

Sorry, that is not possible. Apple Account balance cannot be redeemed for cash or transferred out of the Apple Account except in countries where it is required by law.

click here ➜ Check your Apple Account balance - Apple Support

If cash refunds are required by law

You can’t redeem or return Apple Gift Cards, App Store Gift Cards, or unused Apple Account balance for cash, except as required by law. If your jurisdiction allows for refund of redeemed gift balances, you can contact Apple Support to request a refund. When you contact Apple, include the following information:

• The primary email address that you use to sign in to your Apple Account
• The refund amount
• Your current shipping address

click here ➜ contact Apple Support