1998 was the last good year of Trek until Discovery and Picard. That final season of DS9 was a huge stinker. Voyager and Enterprise were never much good. And Nemesis pretty much killed the franchise until Discovery.
DS9 S4-6
Discovery
Picard
TNG
DS9 S1-3
TOS (many of these episodes really don't age well, imo; there's basically too much magical supernatural stuff for me)
Everything else is bad.