Not listing obvious masterpieces like Breaking Bad or The Office. These are my top picks that may not be on your radar, in no particular order, most of which are just 1 season, or have ended:
Scavenger’s Reign - 1 season, animated, sci-fi drama
The Rehersal - 1 season, Nathan Fielder, comedy, introspective
How To with John Wilson - off-beat, documentation show, very funny and introspective
Jury Duty - 1 season, hidden camera, comedy
Red Oaks - 80s coming of age story
Over the Garden Wall - 1 season, animated, for kids and adults, great to watch during fall/winter
Tales from the Loop - 1 season, sci-fi, Twilight Zone-style 1-off episodes