Have seen Cody Jinks in concert twice now and both have been great shows, the first one I took my then new girlfriend who hated "country" music to his night fall on the river concert and she fell in love with it, and just went to his Dubuque show end of November for her birthday. Tennessee Jet and The Steel Woods opened for him and were both really good.
Cody Jinks started his music career in metal, and calls out "Nashville country" a lot.
Was at the Dubuque concert as well. Third time seeing Jinks, but ever since that night I've been listening to A LOT of the Steel Woods. They put on a fantastic show. Great southern rock sound.
Bunch of people have named a ton of incredible new music, like Childers, Colter, Troubadours, etc., but for anybody who feels like they've been burning through the same albums from the same people, here are a few more that I haven't seen named yet:
Kendell Marvel (wrote "Either Way" of Stapleton and Lee Ann Womack fame)
Flatland Cavalry (pretty new Texas country band, been listening to them a lot lately)
JP Harris (dude was homeless for like ten years, has a throwback honky tonk sound with modern tweaks)
Sarah Shook (very interesting lady, but a total badass)
Ward Davis (wrote Jinks' "I'm Not the Devil" and "Colorado", and probably a few more)
Jason Eady (very stripped down, acoustic sound, and the guy is an awesome songwriter
There are so many more, but these people are the first that came to mind as far as singers who others may not have heard of yet.