Between pitches in baseball, the batter steps out of the batter’s box to re-focus.
The same thing is true in table tennis; the pros often call this the “think circle.”
Between points, step back about 4-6 feet away from the table and draw an imaginary circle around yourself and collect your thoughts in your think circle. Every pro athlete has a different method of processing the points, relaxing, and gearing up for the next point, but I’m going to give you the method that I personally use.
An article related to improving players table tennis skills.