You can not bump the fee because your "change address" which is the first output is only 4500 satoshi and that can not go any lower than that because it is close to the dust limit. that is what the error message in your screenshot is saying.

besides even if you decrease it to 0 it still wouldn't matter in your transaction! 4500 satoshi increases your fee by 0.12 satoshi/byte since your transction size is 34868 bytes.