What advice would you give to a medical branch officer who like to apply to the 75th Ranger Regiment?

I’m currently working as an embedded PT with a BCT, but I would one day like to apply to serve as a Ranger battalion PT. I can’t apply until I have 2 yrs TOS so I have a little bit of time to prep. I have a good idea of what training will be helpful in my particular career field. From a physical perspective I also know what I need to do (ruck, ruck, ruck), but what other skills should I hone before applying. I served on the enlisted side for a long time before commissioning, so I believe I have a bit of an advantage over some of my career field peers, but I am the first to admit that I am pretty rusty when it comes to tactical skills (not to mention I was not combat arms).