This is a similar setup to me. I have one course that has sold extremely well and generated >250k in the last 2 years. And the other 2 have done <$1k

The cross publishing on packt is not as effective as Udemy. I think sales wise, it generates maybe 2% of the revenue that I have on Udemy

Getting in the Udemy business program was a huge revenue boost for my courses since it changes it from making money on sales to making money on watch time