What's the best chances of normal birth? (Not cessarion or operate)

Both of my babies never got into the proper position for birth so I had sections for both. And in fact, my second was surprise breech, so she turned (at 10lb3!) right before my section. It was something to do with the shape of my pelvis. I think you can do things to help, but there is no guarantee.

Baby head down and in proper position to “drop” … there’s lots of exercises/stretches you can do to try to better your chances.

Really though, you can’t fully control it all

The factors you suggest will help wit a good pregnancy but the delivery is out of your control