Pivot idea: Consider using the chart tool to map out relations of characters in stories, TV shows, legal cases, etc.
Service integration (client): Consider if your tree could fit in as a GSuite add-on: https://developers.google.com/apps-script/add-ons/
Service integration (host): create REST API's, or language libraries for people to use your tool programatically
Viral idea: Consider offering family trees for free so Wikia pages can link to them
Viral idea: Consider an embeddable app with zooming/panning that media websites and pay a monthly fee to integrate
Viral idea: Consider an import/export JSON schema users can use to share their graphs