Radar, unless you have already tried, go BUSH young man (person?). Go to the crappiest, worst rathole you can find where there are aeroplanes. Sit it out, in a tent if necessary, and the flying work will eventually come your way. Unless you have a relative already in the airlines, the next best way in to the regionals is to accumulate hours and be current. They don't like spending too much on training, so currency is where it's at, even if it's on singles, tho' of course you would have to take any twin job on offer in preference. Nothing wrong with Chieftains either, and still a few of those out in aforementioned ratholes, I'm sure.
Anyway good luck