Booked room in Carnival Cruises & need to upgrade your room so go through the Carnival Cruises upgrade policy & upgrade rooms easily. Carnival Cruises offers several ways to upgrade your cabin, including promotional offers, last-minute upgrade bids, or booking higher-tier cabins directly. Contact Carnival Cruises Customer Service & talk to an agent for an upgrade.
https://www.getlowfare.com/blogs/how-to-get-upgrade-on-carnival-cruises