I have an internationally recognised qualification for UX and usability - https://uxqb.org/en/certification/foundation-level-cpux-f/ which I think is a really good starting point although you definitely need experience to be able to pass the exams. Personally, I found it so much easier when applying real-life scenarios that I was dealing with to the problems/questions they presented. They also do advanced courses to follow on from this one which I am very interested in learning too.
My advice would be to keep learning, but just be mindful of the ‘value’ of the course, ensuring that it is recognised and contains the topics you are interested in learning
If you have found any, please pass them on!
Good luck :)