After you speed the ball up, the next shot is almost always predictable. Here is where it is going and how to be ready for it before it even arrives.
That is the triangle effect.
Most players speed up the ball, stop moving, and watch to see what happens. By the time they read the return they are already late.
The speed up is the first shot in a two-shot sequence. The goal is to force a predictable return and already be ready for it before it arrives.
Read the Pattern Before It Happens
Speed up down the line.

The block almost always comes back down that same line. The moment you attack, stop watching and get your paddle ready for the return. You already know where it is going.

Speed up cross body on a wide ball.

The defensive block will most often come back cross court. Start recovering to that angle before they even make contact.

Why the Return Is Predictable
When players defend a fast ball they do not have time for a full swing. They are just blocking it back into play and those blocks follow the easiest angle available.
That is what makes the next shot predictable. And that predictability is your advantage.
The Shift in Mindset
Stop asking did I hit a winner.
Start asking where is the next ball going.
Get there before it arrives and you will finish far more rallies than you expect.