...what would your profession/role be, and why?
Would you be a dreadful Inquisitor, battling heretics and thus continuing the crumbling Imperium's existence? Or would you be a cruel warrior of Commorragh, pleasure-seeking and killing to satisfy your ravenous, foul lusts? Maybe, you'd just like to be an ork and kill, loot, and burn. Or would you rather be something else?
You could just be a realist and be content with the fact that we'd all probably be hive-folk working for hours each day just to receive a small payment at the end of the week, but I'd rather everyone be creative and say what you'd want to be if you lived in the galaxy of the 41st millenium.
I, personally, would want to be a planetary noble or governor. I wouldn't have to abandon my family and give my life to the Imperial Guard or Adeptus Astartes, and I'd be wealthy with a big house. If I ever wanted to achieve something greater, I could just pull some strings and join the PDF with a high rank, and then go snuff out some cults or secessionist groups.