How can I pay my YouTube tv subscription early? Say my subscription is due on the 10th and I want to pay on the 3rd.?

There is no direct way to pay early. Subscriptions renew and charge when they are set to do so.

You can however, buy iTunes gift cards and redeem them onto your account, so when the renewal time comes, it will use the gift card balance to pay for it then, rather than charging your card at that point.