Doing the campaign of my curia I used a portal to go to drustvar, after finishing and taking the campaign mission in this place I decided to go to oribos and do mythical but when I decided to resume the campaign I could no longer go to drustvar, investigated about going doing the quest line (quite long) and I noticed that Chromie doesn’t give me the quest chain to go to zuldazar (if I don’t take these missions I can’t see many zuldazar npc) pls help i just want finish my campaign 
yeah this is dumb. the portal was a good idea…but it should be there until you finish the drustvar chain.
https://us.forums.blizzard.com/en/wow/t/cannot-get-to-bfa-level-60-toon/853646
This player found a way to get to Kul Tiras to start the BFA stuff. See if hers works for you.