there is no chance for identifying him. i think. i also lost a lot to this guy. when btc was 2-4 k usd. he didnt have an intention to pay it. i dont think he has an intention now when btc is over 50 k usd. i think he is now in his another scamming projects.
On the contrary, I think that now you and others can possibly identify him or at least find/ trace his moves. Ofc I agree with you that he doesn't have any interest to repay you.
But you should give it a shot...