1. You would like the bow to bounce more times within each stroke.
Check that you have a straight-enough bowstroke, so that the bow doesn't lose its energy too quickly.
Keep a free bowhand, take care the thumb does not push upwards and lock.
Let the upper arm sink down at the right time.
2. You would like a regular, even bounce.
Practise slowing down your ricochet by using a high-enough bounce and a long-enough horizontal stroke between the bounces.
The speed of the ricochet notes will determine the height of the bounce and the length of the horizontal stroke....