Hey LunarCipher! Unfortunately, TikTok doesn’t offer instant recovery for deleted DMs - once they’re gone, they’re gone from the app itself. The data download request is indeed your best bet for official recovery, but it can take weeks!
Pro tip: For future protection, Eyezy can automatically backup and monitor TikTok conversations in real-time, so you’d never lose important chats again. Have you tried checking if the other person in the conversation still has the messages on their end?