I'd tell them about Gardner Dozois's Year's Best Science fiction anthology, which has been coming out yearly for decades. It's filled with amazing writers, many of whom are on your list, and will allow you to read their short work before diving into a novel. I think we're up to volume 33 or 34 at this point, but literally any of them is a treasure trove of both great short stories and writers. Absolutely the best way to discover new writers for people fresh to the genre.
He's also done two Best of the Best, which collect the best stories from all the anthologies.
I have discovered so many great writers here: Kim Stanley Robinson, Greg Egan, Stephen Baxter, Ted Chiang, etc.
This is the list from 2015's volume:
The Fifth Dragon, Ian McDonald (Reach for Infinity)
The Rider, Jérôme Cigut (F&SF)
The Days of the War, as Red as Blood, as Dark as Bile, Aliette de Bodard (Subterranean Online)
The Burial of Sir John Mawe at Cassini, Chaz Brenchley (Subterranean Online)
The Regular, Ken Liu (Upgraded)
The Woman from the Ocean, Karl Bunker (Asimovs)
Shooting the Apocalypse, Paolo Bacigalupi (The End Is Nigh)
Weather, Susan Palwick (Clarkesworld)
The Hand Is Quicker, Elizabeth Bear (The Book of Robert Silverberg)
The Man Who Sold the Moon, Cory Doctorow (Hieroglyph)
Vladimir Chong Chooses To Die, Lavie Tidhar (Analog)
Beside the Damned River, D.J. Cockburn (Interzone)
The Colonel, Peter Watts (Tor.com)
Entanglement, Vandana Singh (Hieroglyph)
White Curtain, Pavel Amnuel (F&SF)
Slipping, Lauren Beukes (Twelve Tomorrows)
Passage of Earth, Michael Swanwick (Clarkesworld)
Amicae Aeternum, Ellen Klages (Reach for Infinity)
In Babelsberg, Alastair Reynolds (Reach for Infinity)
Sadness, Timons Esaias (Analog)
West to East, Jay Lake (Subterranean Online)
Grand Jeté (The Great Leap), Rachel Swirsky (Subterranean Online)
Covenent, Elizabeth Bear (Hieroglyph)
Jubilee, Karl Schroeder (Tor.com)
Los Pirates del Mar de Plastico (Pirates of the Plastic Ocean), Paul Graham Raven (Twelve Tomorrows)
Red Light, and Rain, Gareth L. Powell (Solaris Rising 3)
Coma Kings, Jessica Barber (Lightspeed)
The Prodigal Son, Allen M. Steele (Asimovs)
God Decay, Rich Larson (Upgraded)
Blood Wedding, Robert Reed (Asimovs)
The Long Haul From the ANNALS OF TRANSPORTATION, The Pacific Monthly, May 2009, Ken Liu (Clarkesworld)
Shadow Flock, Greg Egan (Coming Soon Enough)
Thing and Sick, Adam Roberts (Solaris Rising 3)
Communion, Mary Anne Mohanraj (Clarkesworld)
Someday, James Patrick Kelly (Asimovs)
Yesterdays Kin, Nancy Kress (Tachyon)