Some ideas. Not going to mention what's already good in my opinion, only what's not on the mapped already or needs to be adjusted.
While standing
change shoulder view while not aiming- right analog click, (hold)- switch 1st/ 3rd person perspective
X- interact/ pick up (hold x)- auto equip.
Up directional pad- push to talk
Down directional pad- drop item in hand (hold) throw item
Y- weapon switch (hold y)- holster weapon
Left trigger- aim (while aiming left bumper to ADS) (while ADS right bumper to hold breath)
Left trigger while aiming 3rd pp or ADS- left analog click- lean left, right analog click- lean right
While standing or moving
Right bumper- free look
So this isn't everything just what i think would be a comfortable fit for some things. Honestly i love it on pc (but you can do custom mapping on the pc), figured I'd give it a test run and it's not bad but the controls are definitely where the work needs to focus.