What should I do if I don't know when I was born when I was fortune telling?

The eight characters mentioned are year, month and day, which are called four pillars. The four heavenly stems and four earthly branches above are called' eight characters'. If you have fewer children, you are short of words, with only 75% left. If these two words play a big role, they can account for more than 50% of the whole life. There's nothing anyone can do. I can only ask for divination, one by one.