Pushers use a strategy called "Trench Warfare," where they stand way behind the baseline so they can run everything down and moonball you to death.

There are 5 strategies you can use to prevent a Pusher from using "Trench Warfare" -

Strategy #1 - Serve +1 approach
Strategy #2 - Return & volley
Strategy #3 - Climbing the ladder
Strategy #4 - Serve +1 drop shot (Alcaraz uses this one)
Strategy #5 - Drop shot approach (Tsitsipas uses this one)

If you want to check out the "Crush Pushers With Analytics" section from "The New Rules Of Singles" with Craig O'Shannessy then download the Fuzzy Yellow Balls App from the App Store.