I agree completely. Season 4 was an enhanced character development for Alex, and Miles Heizer owned that role! He should get an award!
Brandon Flynn's role as Justin Foley was stepped up for season 4, as well. A lot of dark sadness was developed in his character. Justin's character went from popular high school jock in season 1 to a deep tragedy in season 4. Brandon evolved with his character's deepening in a compelling way. I'm sure that Brandon found Season 4 his greatest acting opportunity for the this franchise, the season for which he'll be most remembered. He should also get an award!