I’d coach the press as a series of connected actions rather than one front-three effort.
If the first line gets played through, the nearest midfielder has to decide whether they can affect the receiver immediately. Behind them, the other midfielders protect the next pass and the back line squeezes enough to keep the pitch compact.
The mistake is everybody thinking “press failed” and dropping 15 yards.
Use a directional game where the opposition get a bonus for breaking the first line, but the pressing team can still score by regaining with the second wave.
That shows the players that one pass does not end the action.
The front three should recover into the next phase too; they are not spectators once bypassed.
A good press is rarely one tackle.
It is repeated pressure that keeps reducing the opponent’s options.
At U14, I’d use the phrase “next player presses, everyone else closes the next pass.”