Don't hit the ball agressively.
Let the ball bounce between 20 -30 cm befor and 20 - 30 cm behind the service line.
This makes it more difficult for your opponent.
Playing the volley is a great shot to attack and make a strong position forward.
It is a heavy shot, the ball dies before the backwall. Play it simple with some backspin.
Focus on your continental grip.
Take the racket back, turn your shoulders.
Step forward. / forhand or backhand side.
Be ready to start the blocking motion.
Keep your forehand and wrist firm
Bend with your legs, not with your hips.
Block the ball and keep contact with the ball
Rebound it back. Stable base, good balance.
Make your moves natural and automatic.
Make the ball bounce soft and low.
Avoid the bounce with the glass.
Brush it more, make more spin and less speed.
Play the ball short. Make the first bounce into the 20-30 area. Cut the ending so it can bounce twice befor the glass.
If you don't play the right volley, you will get a lob or chiquita on the return which can be very difficult to return.