Concerning a team experience matters a lot because during period of downs it is this experience players that the younger players look up to. The issue of Ronaldo mention is a good example, when Ronaldo missed the penalty he became emotional and that was his nature but the ability of him to get back and take the first plenty is what character showcase. In moments like that a younger player will have definitely succumbed to failure and wouldn’t be able to take the next one that will leave other players in fear. We could see when Ronaldo missed the spot kick many of the other players went upto him with talks about the team needing him to stand up to the challenge, that’s what having an experienced player in the squad means, he leads in terms of difficulty
The best way to make up for a missed penalty is to have the opportunity to take another penalty in the same game and convert it into a goal.
This happened recently when an excellent player from the Brazilian team, Lucas Paquetá, kicked the ball out on the first penalty kick, but he had the chance to take another penalty and scored the goal. As a final result, he played very well, he didn't let himself be affected by the misfortune of the first move and the whole team left the field with an excellent result.
In the same way, Cristiano Ronaldo is an excellent player, he continues to be, and he doesn't need to prove anything to anyone. Every good player has missed a penalty at some point (I think) and they don't let that bother them.