Encourage the player to hit deep and/or angled shots by marking a zone where he cannot play into.
Set up the red zone with line markers, like in the video. Make the zone bigger or smaller depending on the players playing level.
This drill is normally done by playing points. Play normal or long tie breaks, or play a normal match.
In a lesson, if you decide to make the players play normal points I advise to start from 30/30 and a golden point or start the set from 4/4 in games. Otherwise it will take too long. If you’re having a match play session of course you may decide differently.