Without a backup, recovery is tricky, but third-party tools like Dr.Fone can sometimes retrieve deleted WhatsApp messages. Success isn’t guaranteed, but worth a try if the data is important.
Check your phone’s local WhatsApp folder—older messages might still be stored there. Look inside the /WhatsApp/Databases/ folder using a file manager app.
WhatsApp often keeps local backups for up to 7 days. If your deleted chats fall within that window, you might be able to restore them by reinstalling WhatsApp.