Traditionally after getting PvP BiS (which is almost impossible in BfA, especially 8.3) you'd go after rating rewards. Elite gear used to have stat upgrades over conquest gear instead of just being cosmetic, which was better IMO. Or just stop and enjoy the fruits of your labor; go one shot people in random BGs or world PvP. The gear progression has to end at some point. Constantly running on a gear treadmill creates burnout. RNG on gear is bad for everyone but especially bad for PvPers since they want skill-based gameplay.
The best part about PvP is that it doesn't need content or infinite gear progression like PvE. The fun is supposed to come from the combat. Outplaying, showing your skill and experience, overcoming bad matchups, that's what it's supposed to be about. That stuff can't be found in legion or BfA, but it's what made me a PvP-only player from cata to legion.