Can you increase my credit limit

No. That's because you are not talking directly to Apple representatives here. In addition, its the bank (Goldman Sachs Bank USA,) associated with the Apple Card, they you need to make the request to. You can contact them here:

• contact an Apple Card Specialist

On your iPhone:

1. Open the Wallet app and tap Apple Card. 
2. Tap the More button .
3. Tap the Message button .
4. Type a message requesting a credit limit increase, then tap the Send button .

dannie209 Said:

"Can you increase my credit card limit"

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No. No one here can do that for you. That is your responsibly.