Have a look at reforge. I once participated in their course on retention and really liked it. Most of the courses are at the intersection of product/engineering

Have a look at reforge. I once participated in their course on retention and really liked it. Most of the courses are at the intersection of product/engineering/marketing, a good interdisciplinary mix I believe. However, every cohort and course is different and I also experienced a not-so-good one as well.