simple wrap acceleration
first efficient acceleration
you just have to "wrap" the diabolo, that mean make a turn around the diabolo with your right stick. This make a turn of string around the diabolo. That allows better friction between string and diabolo, and so, better acceleration.
Warning : You MUST keep your right stick a little bit behind the left one. (that's what I try to show in the profile video). If you don't, the diabolo may roll himself in the string, it will stop everything.
One hand lift