If it's any comfort, the Latin Church is experiencing the same kind of thing. People don't show up for Liturgy but send their children for instruction because they want them confirmed--for what, I don't know; maybe some sort of talisman.
Percentages vary but in some of the region of Western PA it seems that about one third of parish members are active--contributing time, talent, and treasure. I don't know what the answer is. Some people of my children's age with a firm catechetical foundation aren't even having their children baptised. Go figure.
This is not a comfort, it is an outrage! The Catholic Church, East and West, should be working together to bring souls to Jesus Christ and to the Precious Gifts He offers as the "provision for the journey into life everlasting".
Now mind, I don't know what the answer is either, but I am quite sure that there are some Catholic priests out there from this or that church sui juris
who would be interested in serving in another Catholic church. These priests should be encouraged, when feasible to both their own churches and to the one they are going, instead of lambasted.