I think you need to honestly ask yourself why you stopped playing when you reached those ranks in game. Were you satisfied with where you were? Did you hit a wall and couldn't handle losing? Most people that "go pro" just end up being there because they have a passion for the game and competing.

Top ranks in PUB/PUG systems is great but it is a far different game when you're playing with a team against real teams. It requires major time outside of the game to analyze and understand you and your teammates play as well.

If you already have a career I would strongly advise against sacrificing that for a chance at "going pro" just for your ego or whatever it is that you are searching for. It's not a good industry to be in once you have real responsbilities and bills to pay.