What makes you say that? The Orthodox church proselytized the Syrians, Copts, Armenians, Georgians, Ethiopians, Indians, Bulgarians, Serbians, Romanians, Ruthenians, Ukrainians, Russians, Belarussians, Polish, Finns, Swedes, Czechs, Slovaks, Siberians, Tatars, Aleuts and other Native Alaskans, and lately has been growing enormously in Africa, Latin America, the Philipines, and Japan. Indeed, the Polish Orthodox Church has a large mission province in Brazil.
The thing is, the Orthodox don’t go door to door to proselytize because it annoys people. Rather, they build beautiful churches that attract visitors and have many divine services throughout the week, and these services and the mystical theology of the church attract people to come and see.