If you really want a regional job I would apply to all of them, not just Envoy. It’s a fairly competitive market now that the pay is so high. A lot of guys with 121 and/or turbine time are applying to the regionals now. You need an unrestricted ATP to get your app through the door at ACMI or LCCs so I’d recommend getting into the right seat of anything with 2 engines as quick as you can.
R-ATP is only good for getting you into a regional prior to 1500 TT. Otherwise it’s pretty useless. Unfortunately it sounds like you went to Riddle and paid over 2x what you could have paid at just about any other University flight school.