At this point in the series, there really isn't a whole lot you can do for Game 6 except hide the newspapers so the Cardinals will stop reading about how great they are. They're a good team. Far from a great team. I still hope they get to the World Series so I can bet against them. They would get drilled by either the Red Sox or the Yankees.
But back to your question. All you can really do is hope the Cardinals win Game 6 and then see what and if you want to bet on the Astros in Game 7.