I have a movement script, and a 2d physic material attached to my sprite ball.
The material does so it constantly bounches without stopping. But the problem is, it only can jump to a certain point on the y axis. for example when i jump on a platform which is higher than the previous it doesen’t jump that high anymore only to that point on the y axis. How can i fix this?
If I understand what you are describing, this is the intended behavior of a physics object. Jumping higher would be like creating energy from thin air 
My suggestion is: don’t use a bouncy material! in fact, use a material that completes eliminates bouncing. Then you add force at each impact directly from script. Each time the ball touches the ground, you apply an F amount of force upwards. I think this would get you the effect you want.