Or are there other sci-fi shows I should know about?

yes. currently watching voyager again. lowerdecks is really good for modern trek, strange new world is decent. tng is the goat of course.
(a general reminder every time someone says DS9 is the best another "trek fan" is lost to the dark side. although we can appreciate o'brien and dax)

i've heard babylon 5 is supposed to have been good, but i haven't seen it so i can't speak for or against. one of my "deeper cut" favs from that era was sliders tho. The first two seasons specifically. it kinda goes off the rails after season 2 imo. but idk it gets a "plot" but that wasn't what i liked about it.

i have no idea if there are any decent scifi shows in the past 15 years tho, every one i've tried has been hot trash, and i blame the "new" battle star galactica.