I want to do THIS type of work, what should I pursue?

I have a very unusual background, 14 years of experience in tech, employed, humanities degree from a foreign country, self taught designer ( I am really good), I worked as a PM at a small company, managed devs, I know some frontend code, bash script, html, css, some Node and Javascript, how to configure server and even some QT. But I do lack the computer science foundation and my backend code is hacky / copy and paste. My passion lies HCI , direct manipulation, novel user interfaces, and diffusers image/video generative AI like stable diffusion, flux, how can I get into this kind of stuff? I even saw of the some of the black forest guys (behind flux) are here in Ontario (two of them don't even have PHD). Please watch this: https://www.youtube.com/watch?v=H8gr2BZapcE

I'm already 39 years old, to get into UOFT I basically need to start from scratch (according to them) do 4 years traditional bachelor's + masters + research. Is there an alternative?