How can you go from Orthodoxy to Catholicism?
They do not convert to Catholicism from Orthodoxy through baptism. But once I read that when the Orthodox want to convert to Catholicism they are accepted into the Eastern rite church, such as the Uniates. And in order to be allowed to go to a fully Catholic church, you need to find good reasons.
Both Catholicism and Orthodoxy are two branches of the same Christian faith.
Therefore, during the transition to new Catholics - former Orthodox - it is not necessary to "re-baptize", as well as to "get married", for example. Because the RCC recognizes as valid all the Sacraments of the Orthodox Church.
Neophytes-Catholics need to come to a Catholic church and sign up for an annual catechism (studying the basics of Catholic-Christian theology, as well as checking their intention to become a Catholic).
After that, they proceed to confession and communion with a Catholic priest, and then in a solemn atmosphere at Mass they read the Symbol of Faith and officially become Catholics.