One hand backhand drive.
..............
I looked at a few backhands. On the off hand you did not rotate the racket down as much. On the chest press maybe you had that. ? But you did not have the amount of shoulder turn. Check these issues by comparing to high level backhands.
Note- Federer does not appear to have the same chest press in his high level backhand drive.
.........
https://tt.tennis-warehouse.com/ind...and-waht-force-to-start-forward-swing.462997/
It is curious to me to call it "chest press." What looks like a chest pressing out is the shoulders pulling back, the hard flexing, contraction, of the lats on both sides of the back. I've never seen Fed hit a topspin backhand drive (when he has the time) without powering the hitting hand out and up by the lat flex. That flex also sends the off arm backwards. If this maneuver is done, then the forward rotation momentarily stops, then restarts for the follow through. Or so it seems to me....