To delete your Grok chat history, go to grok.com/app or use X and clear your...

https://johnathankvdj950.wpsuo.com/why-does-grok-say-storage-limit-exceeded-after-i-deleted-chats

To delete your Grok chat history, go to grok.com/app or use X and clear your conversations there. Remember, files and Imagine media are not removed automatically and need to be deleted separately