Free will is one of those terribly loaded and almost nonsensical notions on its very face which should be stricken from most discourse on anything.
No one has a free will, one could even argue that God doesn't, this is less clear. But certainly that which is created, contingent, and conditioned doesn't have anything approaching a free will. To suggest otherwise you end up with excesses of weird Calvinisms or equally weird if more elegant Existentialism and other strange ways of reconciling free will with God's agency.
The Orthodox concept is αὐτεξουσία. It's not exactly "free will". Literally, it would be "power/authority over oneself", "self-determination".
“I call heaven and earth to witness against you today, that I have set before you life and death, the blessing and the curse. So choose life in order that you may live, you and your descendants, by loving the Lord your God, by obeying His voice, and by holding fast to Him; for this is your life and the length of your days.” (Deut. 30, 19-20)