There are so many different things you can do to challenge yourself on the volleyball court. Working towards improving your stances and serving is important to the game and is challenging to work on and get use to. Some people find unique serves like the jump serve difficult and challenging to do as well. Although your serving and passing/bumping might be good, it won't matter unless it is consistent in a game. Working on these two areas and strengthening them will most definitely benefit you on the court. Bumping the ball to the setter is also a difficult task, because of the angle and speed it needs to be at for the setter to hit the ball perfectly. Working to get these few challenges done is a hard task. If you were to finish these task, search up more to make yourself stronger and stronger.