Hey Peter, your current Pro Plan is set to renew credits on Dec 1. Instead of waiting til Dec 1, what I can do for you is process your plan's renewal now so that you don't have to wait until Dec 1 for your credits to refresh at your set price.
Another option here is purchasingcredit top-ups, which would be $720 for 30,000 more credits.
Happy to proceed with whichever option you prefer, let me know what you think!