There are a lot of messages of old on here that mention about teshuva and improving. But some of them don’t say what to improve on. IMO, I think that the one thing that we Jews can all improve on is internalizing what we learn, and feeling Hashem in our heart. Many people learn what to, but don’t feel so much the beauty and joy. Hashem wants us to serve Him with joy. I feel that if we instilled this is our children, they wouldn’t want to depart from it. Let’s find something that we can each improve on and make a difference for both ourself, each other, and the world.