If you're going to do this do it ASAP. Every day you delay you reduce your long term QOL ten-fold. If I were you I would go to PSA in a heartbeat as well. Living in base, this job is a completely different gig. Even at a regional. Don't listen to people on here, they talk big but no one at the majors cares who the &^$# Gojets, TSA, Pinnacle, PSA, Skywest etc. are. Nobody cares, they worry about other stuff like "Which crew meal? Chicken or salmon"? The only people who care are those who have recently moved on and still identify with their past airline, and they will soon forget.
The ONLY thing you should concern yourself with at this point is
1) Go to a growing/high turnover company
2) While as an F/O start your 4 year (THIS IS IMPORTANT)
3) Apply to every carrier out there you feel meets your needs
4) Upgrade ASAP at the earliest possible time, and then fly as much as you possibly can
5) While in the union volunteer for a lot of safety related stuff, airlines like that and it will give you something to talk about
Don't become one of these guys who spend 10 years at a commuter then complain they can't get a call meanwhile they've been sitting on their ass the entire time and don't even have a 4-year, and they miss two large hiring waves.