Unraveling the mystery of non-engagement

Dear Gail, "I loved your new video on exercises for optimal fetal positioning!

I finally got my second baby into the right position but alas, he did not
engage and I did not go into labour which resulted in an elective
section at 42 weeks.

I had a previous cesarean when my waters broke without contractions. My first baby didn't
engage despite being induced.  I'm now wondering if there is