honestly baal tz (throne) isnt even that great, it's severely overrated / just a lazy way to level if you do throne. sharing xp with 7 other people is just slow, the only decent one to share are those 40-45 second chaos tz runs.
in fact if you were to do solo WSK on any char that is not a barb or necro, you would get muchhhhhhh more xp per run.
i personally got about double the xp in WSK on a hammerdin/fire druid (which are maybe B to low A tier at best) as opposed to doing throne with 8 people.
so yeah, just join baalruns and solo clear whatever decent terror zone is up (i would just play at the top 5-15 zones, depending how fast u wanna hit max level and how much time u have)
heres an accurate tierlist of the zones:
https://forums.d2jsp.org/topic.php?t=102738008&f=148