There are a few things you can do to fix a top that shows too much cleavage. First, try wearing a camisole or tank top underneath your shirt. This will help to fill in the gap and give you some extra coverage. If you don't want to wear an extra layer, you can try using double-sided tape or fashion tape to keep your shirt in place. Finally, make sure that your bra is the right size and style for your body type. If you're still having trouble, consider investing in a good quality push-up bra or straplessbra.