Ugh, the classic WhatsApp gut-drop moment — cleared chats are gone locally, but your one real shot is restoring from an iCloud backup that was made before you cleared it (uninstall WhatsApp, reinstall, and hit Restore when prompted). Big caveat: it rolls your whole history back to that backup point, so anything newer gets wiped, and if no pre-clearing backup exists, those messages are honestly unrecoverable. TL;DR: if a backup from before the clear exists, restore from it; if not, they’re gone — going forward, a notification-logger or chat-backup tool is your best safety net.