Is there a breaking point in high jump?

my current record is 5ft6in and i want to get 6ft over the summer. i've steadily increased my height all year starting at 4ft10in and climbing to 5ft6in. so do you think i can keep going? or is there a breaking point? a point where i can't cross because of reached maximum height. i don't think so, i do workouts and stuff to increase my vertical...and it works. so is there such thing as a breaking point in high jump? is that a reasonable goal? help please.