Modern Bluegrass

Be Good Tonyas

Saw Chris Thile live twice in person in September/October.  Amazing shows!!!

Crooked Still
Hawktail
Darlingside

Punch Brothers are doing a live show on Mandolin the next two Sundays ...

Infamous Stringdusters
Old Crow Medicine Show
Railroad Earth

Rising Appalachia

bunch of videos I haven't seen

https://www.youtube.com/watch?v=0iNDLUlF2vM&list=PL0508545E9DCC3E1D

slow start, let them get into it

https://www.youtube.com/watch?v=QqaMQirDOss

Bought this album, terrific

https://www.discogs.com/sell/list?master_id=1556415&ev=mb

I use Pandora ’stations’ to hear them, and others like them,

Steve Earle record, The Mountain, with Del McCoury band.  

As others have said, check out Billy Strings. This young guy is phenomenal. He plays guitar, banjo, and mandolin; sings; and writes songs. Knows all the classic tunes, and seems to be all about the music. I just love him!
If you haven't seen it, this YouTube of him with Del McCoury is a great, It's hard to say who's more thrilled, the young guy playing with the legend, or the legend playing with the young guy sure to carry the torch forward.

Try the Steep Canyon Rangers start with and their album the North Carolina Songbook.

+1    Really good album!

If you like Nickel Creek have a listen to Sarah Jarosz Follow me Down - great production really good album.

Punch Brothers would likely be a good one to check out as well.

Pretty much anything by David Grisman sounds great and has excellent musicians on it.

I second Billy Strings. 

Sara Watkins
Sarah Jarosz
Aoife O’Donovan
Mandolin Orange
Stray Birds
Shovels & Rope

I've recently learned of a guy named Billy Strings. The guys picks a guitar like nobody's business. He's got solo and colaboration work on Qobuz which then suggests similar bluegrass groups underneath.
Happy hunting

Try the Steep Canyon Rangers start with and their album the North Carolina Songbook.