Blocking and floor defense should work together. Decide what the block takes away, then position and train the defense around that choice.

A blog article provides a useful progression to think about defending in volleyball, though there are some fuzzy points in the systems side.

A fellow volleyball coach highlights a weakness of heat mapping to help decide what type of defense you play

Making your team strong in defense generally means addressing four primary areas of focus - blocking, system, digging, and mentality