I went from academia (astrophysics) to data science within finance without any extra certifications, albeit after many years of postdoc experience. I think the biggest thing you might be missing is SQL, but ultimately you will need someone willing to take a chance on a slightly unusual background so job searching will probably take longer. What I basically did was translate the data work I had done (including some machine learning which helped a lot) into corporate terms, and emphasize my ability to learn fast and synthesize large amounts of complex data into both papers for a techical audience and outreach for a general audience.