Do you think a Graph Database could help you but don't know where to start and how that could turn into production? A possible data science lifecycle is what you get here: building a graph with data stored in your relational database, identify the interesting queries and analysis on the graph, convert them back to SQL to run in your database.
Oracle provides a full set of solutions thanks to its Property Graph engine able to use Oracle Database as backend for storage and options to “offload” queries from the graph directly to the relational database.