Interconnection within custom visualization

I am using BI Power Tools with custom visualization to develop this (please refer to the overview diagram)

Initially, I’ve found three challenges:

  1. How to embed the interconnectedness (see the lines with red dotes) within these customize visual diagrams?
  2. Putting flow to ease the cognitive understanding.
  3. Tracing the specific information when going to the deeper level ( filter) – in which the current dashboard will go to different pages.