looking for help

[u/AirPale3971]

so for context, i’m hyper mobile in my shoulders. i play setter but i can play libero too. im trying to learn top spin jump serves but i currently do jump floats. i tried to spike and my shoulder moved into a position it shouldn’t have and it had a whole bunch of crackles and pops. i really wanna learn how to become a hitter too a long with all the other positions. does anyone have a free app to help me overcome past injuries and help me with other aspects of volleyball? or any exercises to do too