You are most likely a quick hire!
First, you need to relocate to the US. Then get the green card and start applying. I'd recommend skipping the regionals, why take a step back, you already fly the A-320.
Join all the airline websites, load up your data and I'm sure the emails, and phone will start ringing.
Want Chicago, apply to all of them. You will be assigned the junior base, but with the current trend, in a relative short period of time, ORD/MID will open up. If the base is senior for the airline it could take a little bit longer, as will upgrades to larger equipment and the left seat.
Good Luck