From that list, Yueill, Llanez, Lletget, and Zardes are definite no's. I think Johnny, Aaronson, Richards, and McKenzie are all questionable. I agree with the rest.
I think you need another fullback for that list. There's only three listed. Since Dest might be the starting LB, you could probably get away with another RB. Yedlin, if he's playing, or a young kid like Araujo, but whoever is that player is probably fourth string fullback, at best. If you really wanted another natural LB, Vines.
And you need some more strikers. You can take 3 with Morris as the 4th option, but you need at least another two #9's, and I think we are past the point where Zardes/Altidore are viable options. Sargent+two of Dike/Akinola/Soto/Gioacchini/Weah/Ferreira/Wright/Ebobisse. You could even say that Sargent is in that same competition and its three of those players, but I think Sargent has the best grasp on a spot of any of the young strikers right now.
If it was my pick, I'm taking Ledezma over Aaronson right now for a back up CAM spot. The hardest spot to pick is likely that back up DM spot. Yueill wasn't even playing that role this season for his club team, and its questionable if he's ever been good at that spot. I would put Sands there for now in that back up spot, but it's up for grabs. Johnny isn't a bad option either for that spot. Llanez spot should go to Mueller. I don't know how much better Mueller has to be in the last year to take that spot. One of the best players in MLS, and great in his debut for the NT.
Richards/McKenzie are in that CB discussion. You could also group Long into there, but I don't think you can use three young CB's, so if we are using a second veteran CB, I'm taking Long over Zimmerman or Ream. Are Richards/McKenzie better than EPB/Miles Robinson/Miazga? I don't rate Miazga. If it's my call, I'm going with EPB and Richards for now, but McKenzie is close.
Keeper: Steffen, Turner, Horvath
Defenders: Dest, Anton Robinson, Cannon, Araujo/Yedlin, Brooks, Long, two of Richards/EPB/McKenzie
Midfielders: Adams, McKennie, Musah, Sands/Johnny, Pulisic, Reyna, Morris, Mueller, Ledezma/Aaronson
Strikers: Sargent, two of Dike/Akinola/Soto/Gioacchini/Weah/Ferreira/Wright/Ebobisse