Palace took charge of their quarterfinal with a 3-0 first-leg win thanks to goals from Jean-Philippe Mateta (penalty), Tyrick Mitchell and Ismaila Sarr.
Despite the scoreline, Richards insisted: "Of course we want to get to the final, but we understand it's one game at a time.
"So I think it'd be dumb to say that we're already looking at the next opponent.
"Again, we have a whole other leg still to play and it's going to be a hostile environment in Fiorentina. We understand that we have to go and get a win there.
"We always focus on making sure that we maintain a clean sheet because it allows the people up front to do what they need to do.
"Defence isn't always, you know, the most beautiful thing to do! But whenever you get a clean sheet, it always helps the team."