To re-enter Trade Chat in World of Warcraft, press Enter to open the chat box, then type /join trade and press Enter. This command will rejoin the Trade channel if you’ve been removed or left it. Ensure that Trade Chat isn’t muted or filtered out in your chat settings by clicking the chat settings icon and verifying the channel settings. If you still can’t access Trade Chat, check for any account or server restrictions, and consider contacting Blizzard Support if the problem persists.