Welcome to the Forum, Sophia!
As a non-ethnic Orthodox Christian, the question you posed once confused me,however as I began to meet Orthodox Christians of various jurisdictions and traditions, I learned much. Each tradition in the Orthodox Church is rich and varied in practice and traditions. The United States prides itself at being the melting pot or stew pot depending on whom you talk with. American Orthodoxy is still developing. What I have learned is that American Orthodox people will eventually develop its own traditions and the question is more appropriately what will it look like?
1)It will observe the fasts and Feasts of the Orthodox Church.
2) It will serve the services of the Church (the hours, Divine Liturgy, akathists, etc)
3) It will adopt those ethnic traditions that have meaning to the American Orthodox and drop others that don't (I believe for example that caroling during Nativity will remain in an American Orthodox Church however things like "Starring" something I enjoy, the Pascha Lazarene singers, and Basil Kalenda singers on Januray 1st will probably not be adopted)
4) Festivals will probably continue as money makers for parishes but may change into more localized events for example a Parish named after St. John the Forerunner may not have a Medfest or a Greek Food Festival if the ethnic identification is gone but may hold , lets say, a St John's Honey Festival to make money for the parish and offer evangelical and fellowship opportunities)
5) It will be evangelical, more out reaching to non-orthodox, to bring them into the church.
6) It will have Orthodox Monasteries, sketes, anchorites, charities, camps, hospitals, nursing homes, and other institutions.
In the mean time, enjoy the cultural richness that ethnic Orthodoxy has to offer. Look at the spirituality of all jurisidictions and find which one of the deep spiritual diversity Orthodoxy offers to you to develop yourself and help you toward Theosis.
Once again WELCOME!