Look at it this way, being so far behind means you have nothing to lose. You already know the odds aren't in your favor, so relax, don't worry about winning, and play your game. Everybody else will be putting pressure on themselves fighting it out, it might cause them to make a couple of extra mistakes and let you back in. However, since the tourny is not in your hands, just have fun with some more bowling, and hopefully you'll get on a roll. If not, you've already wrapped up 4th which is always an honorable finish.