At the risk of stating the obvious, either 1) Your adverts are appearing on page 7 or 2) People aren't searching for your keywords. If it's 1, there's not much you can do about it, other than increasing your bids. If it's 2, then either they are searching for your product/service using other terms, or people aren't searching for what you're doing...
my guess is your keywords are really long tail like "where to buy widget for cheap" If your just bidding on "widget" Then your bid is probably way to low