If you haven't seen the Americans then I'm wondering if there are other prestige shows you haven't seen.
If you haven't seen:
Breaking Bad
Better Call Saul
The Wire
The Shield
True Detective (esp Seasons 1 and 3, but each season is stand alone)
Ozark
Curb Your Enthusiasm
VEEP
you should make those a priority.
Other "mainstream stuff" that is very good:
Silicon Valley
Barry
Eastbound and Down
Flight of the Conchords
Rescue Me
Louie
You're the Worst
More obscure things that I have enjoyed:
Dark (Netflix, 2 seasons, suspense/scifi drama)
End of the F**king World (Netflix, 2 seasons, dark comedy)
Sex Education (Netflix, 2 seasons(?), comedy)
F is for Family (Netflix, 4 seasons, animated comedy)
Master of None (Netflix, seasons, comedy)
Generation Kill (HBO, military drama)