Course Enrollment and Revenue dropped 50% Advice?

Hello all! Looking to get some insight on this. I have a somewhat popular program management course on Udemy. After about 2 years of steady enrollment growth and revenue (3400 students, ~$500 MRR), enrollment has taken a hit.

I haven't changed a thing or done anything differently. I'm not sure if this is a Udemy thing (unlikely, I think) or if this is related to something else.

I suspect it may have something to do with my course ratings, however, it hasn't changed much in recent months. It's only dropped from 4.52 -> 4.40. Perhaps it has something to do with the fact that I haven't updated it in a few months? Maybe I should add some additional content?

Anyone else experience this with their content courses?